Develop Bugs

Hyperion Extended Battery

Ordered this a few days ago and it came in the mail today, it says for the i9300 (international) but I took the chance and it works great for my AT&T version.
http://www.amazon.com/gp/product/B008BVIV06/ref=oh_details_o01_s00_i00
It's a Hyperion 4000mAh extended battery. Its about the double the thickness of the stock battery and has a new back cover to come with it. On the card included with it, it suggested a 12 hour initial charge and then 4-5 cycles to reach full potential. I will be following up on the thread periodically over the next few days with some screenshots and other thoughts on how the battery is working out for me.
However, initial impressions are good. The back cover is good quality, however very slick compared to the stock one. The thickness with the added battery isn't terrible, and will definitely be worth it if it doubles the battery life like it should.

On the amazon site it looks enormously thick, like a half of an inch or so, can you measure it for exact thickness please?

obender said:
On the amazon site it looks enormously thick, like a half of an inch or so, can you measure it for exact thickness please?
Click to expand...
Click to collapse
5/8" thick total. Like I said, it makes it quite a bit thicker but double the juice... You gotta put it somewhere lol. At least it looks a lot better than the Note extended batteries did, those looked atrocious. There was just a bump where the battery was but behind the camera was stock thickness and it looked horrid.

Does the battery have the NFC antenna?

No nfc and bulky on a rather sleek n sexy phone...no go here. Plus the battery life on this thing is SICKKK, why the need for the extended batt? I could reason with an extra battery.

Well to add to my review, the back panel breaks VERY easy. My phone took a 2 ft tumble off my bed and it took a chunk out of the battery panel that came with the extended battery.

I was thinking of either getting an extra battery it just buy one of those battery packs that recharges the phone. Friend has one of the Energizer packs for his iPhone and it appears to work really good, that he bought an extra one.
Sent from my SAMSUNG-SGH-I747 using xda premium

I bought one of these a year ago and it works awesomely
http://www.newegg.com/Product/Product.aspx?Item=N82E16875993507R
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I use my own AA rechargeable batteries (instead of alkaline disposables, which also work fine)
(I don't charge the AA's with its included AC plug, though, I have a better charger I use)
hard to beat $8

Beakerzor said:
I bought one of these a year ago and it works awesomely
http://www.newegg.com/Product/Product.aspx?Item=N82E16875993507R
I use my own AA rechargeable batteries (instead of alkaline disposables, which also work fine)
(I don't charge the AA's with its included AC plug, though, I have a better charger I use)
hard to beat $8
Click to expand...
Click to collapse
Unfortunately, $6 shipping.
Looks nice though with an equivalent storage of approximately 2000mAh with 4 NiMH's in it @ 5v or 10Wh (minus whatever conversion losses, probably about 10% so 9Wh). Original battery is about 7.8Wh capacity.

if you want a good external battery pack goto amazon. serach for vaas battery. get the $28.99 shipped one with the 2.1 amp output
sadly its mini usb not micro to charge but at least its STANDARD and not proprietary. it charges up my S3 just fine should be able to get 2 full charges out of it or run the phone for DAYS if you use it while the phone it already fully charged.
it is by far the best battery pack I have purchased yet I would not by anything else.
they have a cheaper one. SAME battery but less amps on the output. if you buy 2 to avoid shipping its under $16 a pop ($15.70 each) but I am not sure if it has enough power to charge. I know the 1amp outlet on my unit does NOT properly charge my S2/S3 (trickle charge) I have to use the 2.1 amp outlet.

Stock charger for the S3 is 700mA so a 1A charger should be more than enough. Some dual port chargers list 1A but limit each port to 500mA. I sometimes wonder if using higher capacity chargers (I've been using some HP Touchpad 2A chargers) might have thermal issues shortening battery life. But, I like the quick charge.

my stock s3 charger is 1A ??
there is "port" differences. I have a VAAS battery pack I use (6 of them I power a lot of stuff) and the 2.1 amp port charges the S3 fine but the 1A port is "slow" (trickle??)

Anyone having problems with this? Fit, finish and signal?
I just got the Hyperion Extended battery with the dark colored back. I also got their case to fit it.
All was well when I put the new battery in and covered it up with the new back cover. I then installed the case and left it to charge. That took about 3 hours to go from 58 to 100.
When I picked up the phone, I noted that there was no telephone signal (at home it was on wifi). I checked the settings (not in airplane mode) and then turned it on and off again and it was still no telephone signal. So, I took the case off, put the old battery back in and all was OK. I switched back and the signal is now good.
I noticed that the back cover was dirty. I thought I had gotten some kind of smudge on it so I wiped it off. The smudge just got bigger. The cheap coating of paint was coming off.
Earlier, I had noted that the charger plug didn't feel quite right. When I looked closer, I saw that the small top part of the opening for the plug didn't quite fit. We're talking a millimeter or so, but it doesn't quite fit. It is so thin that I cannot consider cutting it.
My first inclination is thinking that Hyperion is junk. Since I have been considering getting a new, bigger battery almost since I got the phone a couple of months ago, I don't want to give up.
So, what are your experiences with this company's products? If I send any part back, I have to send it all back. The battery came with the big cover so if I send back the cover, the battery goes with it. If I send those back, I don't need the case.
Where do I go from here?

I just bought the Hyperion as well. So far, so good. I did get the Hyperion case as well. The power and cooling buttons are really hard to push. Can anyone suggest another case that will fit the Hyperion?
Sent from my SPH-L710 using xda premium

No issues with mine so far. No signal issues like other member mentioned. The back cover fits very well. Charger plugs up with no problems.

Review of DX Wristband external battery + bonus accessory w/lots of pics!!!

This is a review of Wristband External battery from dx.com. http://dx.com/p/1500mah-silicone-wr...r-w-adapters-for-cell-phone-more-black-122654
I have done my fair share of battery reviews in this forum (just check my signature link), and made a decision that I'm not doing any low capacity ext battery reviews unless it's something very unique and cheap. This wristband external battery definitely qualifies as both! It's funny how every time I read about smartwatches and their poor battery life, this battery always pops into my head as something they can use as a wristband to clip their watch to lol!!! You never know, when you are away on a trip or outdoors maybe someone decides to use it, although it obviously will be a challenge with all these smartwatches that use a proprietary charging connector. But one thing this wrist band can be used for sure - when you are watching movies or recording videos or playing video games. It will come handy in any situation where you want to give your smartphone extra juice while using/holding your phone with your original case on (no need to hold separately an external battery or to get special battery case).
Advertised as 1500 mAh capacity, I wasn't quite sure how comfortable it will fit on my wrist (I do have a small wrist) and how heavy it's going to feel. To my pleasant surprise I found this wristband battery to be very light at only 85 grams and with its soft silicone mold it was very comfortable to wear. Silicone material completely wraps and seals around it so there is no worries especially when you are outdoors. The battery cells stored in 6 rectangular sections, and there is a separate section in the middle with a sealed power button and 4-led indicator. Such design makes it very flexible to wrap around your wrist. It locks with a snap button and you get two position for a smaller and a bigger wrist. The middle power section has mini-usb connector which is used to charge the wristband battery and also to charge other devices connected to it. For that occasion included in the package is a total of 13 different tips. I'm pretty sure I have seen some for Nokia phones from 6 years ago lol!!! The most important, you get your micro-usb adapter and that's all that you will probably need.
From a spec perspective, this battery doesn't have the fastest input or output charging speed and neither does it has a super high capacity. Charging speed of the battery is not a big deal since the capacity is not that high anyway. Charging speed of the device is probably close to advertised 750 mA, where using my Galaxy Charging current app it showed 600 mA and I know that app is not accurate. When I was timing charging my phone, the charging speed was more in line with 750 mA. And speaking of charging, based on the % of my battery charged in the phone, it translated into the actually capacity of closer to 1650 mAh, which is higher then labeled 1500 mAh. That was the biggest surprise considering the actual capacity is typically 30% lower then labeled. For a phone like my Note 2 with 3100 mAh battery this will obviously not charge the full battery and will not do it at max 2A charge speed, but it will definitely help if you are watching a movie or playing a video game from draining your battery. The most important point of it - the convenience of being able to wear it on your wrist while holding the phone.
Overall, I'm not saying this is a must have accessory for everybody, and for emergency back up charging of your phone you would probably want to look into 10k-15k mAh capacity batteries. BUT, for the purpose of convenience this wristband battery was designed for - it does an Excellent job, feels very comfortable, provides actually a nice chunk of battery boost, and cost about $20 plus change. And the reason I like to deal with dx.com for such gadget purchases because I prefer their customer service, selection, and them always take care of you if something doesn't work. Buying from ebay is like playing russian roulette.
Here are the pictures.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
With this review, I decided to include a bonus mini-review of another cool "toy" I got from dx.com along with my wristband battery. You guys, and maybe some gals, might appreciate that This is a review of Stainless steel manual-release folding knife with a clip. http://dx.com/p/stainless-steel-manual-release-folding-knife-with-clip-20-0cm-full-length-48331
I review a lot of gadgets and always try to share with you cool stuff I find on internet. As part of my reviews, I receive a lot of boxes in the mail and realized that I usually reach out for scissors in the house to cut/open the box with a pointy tip. So I figured I need to get a cool knife to open all my review boxes. One thing led to another, and I was browsing through dx.com catalog trying to see what they got. A lot of stuff looks cool, and it was hard to choose. Therefore I was relying on a number of positive customer feedback comments, and came across this super cool knife for an unbelievable price of only $7.99.
Now since I received and played with this knife (ok, this is not a toy but a serious tool, so "play" with CAUTION!!!), I thought it was so cool that I wanted to share it in my little review. First off, its all stainless steel. It feels very solid, has a nice balanced grip, and a decent 152 grams of weight. Folded, the knife is about 120mm, with a fully extended size to 200mm. All the pieces are held together with hex screws so you can always tighten it, if needed. It has a metal clip on one side, a well hidden rope cutter at the end-side and a window breaking solid metal point at the end point. This knife opens up with one hand flick and spring loaded assistance, and you can close it with one hand as well by pushing the inner spring leaf out of the way (btw, very impressive safety mechanism). The blade itself has a nice baked in color, while the knife handle has it painted with a shiny coat of finish (that might peel after awhile).
Overall, I thought it was a very well made piece that can find so many uses either to open a mail or for any handy activity around the house or outdoors, or just to keep it in the car since it has a rope cutter and glass breaker (for seatbelt and glass, if God forbid you need to use it). For the price of only $7.99 it was very impressive considering quality of the build and the material.
Here are the pictures.

Review of New Trent PowerPak Ultra rugged 14,000 mAh ext battery w/lots of pics!!!

This is a review of New Trent PowerPak Ultra rugged 14,000 mAh external battery. http://www.newtrent.com/store/iphone-external-battery-iphone-portable-battery/nt140r-o.html
What is a first thing that comes to your mind when you hear water proof, dirt proof, and shock proof? I can guarantee it won't be external battery, but rather some super rugged cases to protect your smartphone or tablet. Now, imagine this rugged case houses a whooping 14,000 mAh of juice enough to charge up your smartphone or tablet multiple times in any extreme outdoor condition while being able to survive most of the extreme elements of nature. You don't have to imagine this anymore, because New Trent new PowerPak Ultra is exactly that product. To be honest, I was actually surprised they are the first to come up with such brilliant solution considering external battery pack is one of the top necessities for anybody doing outdoor activities away from a power source. So, let's take a closer look at this new Ultra PowerPak.
Typical for other New Trent products I received in the past, Ultra arrived in a premium package with a flip cover and a lot of info to walk you through all the features even before opening the box. Available in two finishes, orange and gray, for my review I chose an orange finish since it will stand out better in any outdoor situation and will be easier to locate if you drop it or misplace it. Yes, I did say "drop it" which for it's IP67 rated enclosure shouldn't be a problem. Of course, such protection comes at expense of an additional weight and size bulk, but it's manageable. With a dimensions of about 5.5" x 3" x 1" it's about 1.5 times thicker than a typical ext battery of such capacity. Also, at 366g it's a little heavier than other similar capacity batteries. But upon closer examination you will realize that additional protection layer fully justifies this extra bulk. The front and the back of the battery are made from a durable scratch resistant PC material, while the edges enclosed in a dense rubber material with a ribbed case design that gives you an excellent grip. You have full corner and side protection and both front and back have 8 standoffs to keep Ultra from sliding off any slippery surface.
On a front of the battery, you have a power switch, fully sealed and rubberized, next to 4 blue led indicators for 25% capacity/charge incrementing indicators. The design of the switch prevents any accidental turn on where you have to press and hold it for 2 seconds before you start charging. This is a very important detail since you can have this battery in a backpack with other stuff, and don't have to worry about accidental turn on/discharge. The charging micro-usb input is on a side/corner with a secure port cover. As a matter of fact, it's secure enough that you will need to apply some force to open it. The same with 2 output full usb ports. It designed like that intentionally in order to meet full water and dirt protection. As a matter of fact, the included detailed manual mentions that a battery has been tested to endure being 3 feet underwater for up to an hour.
Of course, this is still a battery, so let examine it's functionality. As I mentioned above, it has one charging Input and two Output ports, rated 1A and 2.1A. According to the spec, the input is rated at 5V/2A which suggests a super fast charging of the battery itself. My battery came 50% charged, and while I was timing it going up to a full 100% charge using included high quality usb cable, I noticed that charging speed was more inline with 1A-1.5A which is typical for external batteries and their 5V regulated converters. Basically it means that a full charge from empty will need about 12 hr on average, but you have to realize you are dealing with a huge 14,000 mAh capacity and this charging time is very reasonable. Regarding a total capacity, as you can imagine it's a max rated capacity of the internal 3.7V battery, and while converting it to 5V going to your usb cable, the efficiency of the conversion will lower the actual available capacity, so you should expect realistically about 11,000 mAh. This is typical for every external battery as well, to lose total capacity due to conversion efficiency. Regarding 2 output ports, although they are rated as 1A and 2.1A, I was able to charge my Note 2 out of each port with max 1.8A speed. You just have to keep in mind that you are sharing 3.1A between two ports, so for example charging Note 2 and Nexus 7 will be done simultaneously at full speed, but charging two Note 2 phones will lower the charging speed of both.
Overall, I was VERY impressed with a built quality of this Ultra battery. Without a doubt, high capacity is a huge plus and it will be fantastic for outdoor use. I have reviewed a ton of external batteries in the past, and can tell you with certainty that I'm not sure if any of those would survive a serious outdoor drop, and can tell you for sure they won't survive drop in a water or a mud. If you are doing a lot of outdoor activities or working outside and need to keep a rugged external battery by your side, there is no other choice I can think of now beside this new Ultra. Extra rugged design/enclose will also come at extra premium you have to pay in comparison to other batteries with a same capacity, but in my opinion it's well worth it. The only comment/improvement I would suggest is that in the past I've seen a lot of dual output ext batteries with a led flashlight which I think would have been cool in this design considering it's targeted for outdoor use. Also, maybe a way to attach carabiner or lanyard would have been useful. Other than that, its perfect as is!
Here are the pictures.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Review of Anker Car Jump Start battery (400A) and Portable Charger (10k mAh) w/pics!

This is a review of Anker Car Jump Start Battery and a Portable Charger. http://www.ianker.com/product/A1501011 , available on Amazon: http://www.amazon.com/gp/product/B00T2GT9L4/
After reviewing so many different Anker batteries, I'm more used to writing about their products that can save your phone. Here is the first one for me - a product from Anker that can actually save your car and perhaps turn into a real Life Saver if you are stuck in the middle of nowhere! After so many snow storms, last few months have been rough here on East Coast. As I mentioned in my previous Astro E7 review, I usually prepare for the winter with extra bags of salt, a few canisters of gasoline for our portable generator, and making sure all my external Anker batteries are fully charged! But one thing I didn't account for was my 8 year old original car battery that gave me trouble early one morning when temperature dropped below zero. Thank God it was in our driveway next to my wife's car, so I had access to jump start it, but a thought crossed my mind if I would have been away at work, stuck in the empty parking lot. I ended up replacing my car battery about a month ago, and when found out that Anker is releasing a jump-start battery for the car - I requested a review sample to learn more about this fantastic product. I do have to admit that I didn't get a chance to use this battery to actually jump start the car because you do need a car with a dead battery for that test. But I wanted to review this battery based on what it's capable of. Just think of it as insurance, something you have to invest into once to protect you in the future.
Let me first start with a packaging, something everybody will appreciate since it's a sturdy hard plastic case with a molded handle and two locking latches – a case intended to be stored away in a trunk of your car for emergency use. Even before you open it up, you know right away this is a tool box, not a toy. Once opened, you will see a top cover with a foam lining and a plastic form-fitted tray at the bottom partitioned with sections for the battery, jump start cable, and charging cables. Such partitioning is very important because you don't want anything to rattle or slide inside of the case when you are driving. In addition to the battery itself, you have a variety of cable accessories including 15V/1A wall charger, 15V/0.8A car charger, usb to micro-usb charging cable, jumper cable attachment, and a very comprehensive Manual/Guide.
Unit itself is a 10,000 mAh battery. If you need to quickly charge it up, using slow 5V input charger will not be enough. Utilizing 15V input reassures that your Anker battery will be fully charged and ready in no time! Also while keeping it in the car, the battery will stay "fresh" for about 3 months in standby, but you have to be sure to periodically check and charge it up if necessary. As a matter of fact, convenience of both wall and car chargers will give you a flexibility to be able to charge this battery even when you are driving. Once fully charged, you can always check the capacity by pressing Power button and checking 4-led indicator on the side. Right next to this led indicator you have 2 usb charging ports, rated at 1A and 2.1A, to be used for emergency charging of your smartphone or tablet. Next to that you have 15V/1A input port, and 12V/200A jumper cable port covered by a rubber flap to keep contacts clean and dust-free.
The battery housing is made out of sturdy plastic with rubbery side grips all around it. The size of the housing is not exactly pocket friendly measuring about 7.3" x 3.3" x 1.7" and with a weight of about 385g, but as I mentioned before this battery is intended to be stored inside of the case in your car trunk. It's clear this battery was designed with durability being its higher priority. Another very useful element of the design is a front facing powerful LED light. It gets activated with a long press of a power button to start with a solid light, and switched to slow and fast blinking with a follow up short press of the power button; another long press turns it off. The light is very bright and can come handy in different emergency or even everyday use situations.
Even so this is very capable high capacity rugged battery with a wide angle super bright LED, a real star of this product is Jump Start cable! Operation is VERY simple. First you need to be sure you have at least one solid LED indicating 25% of charge still available. Attach Jumper Cable, easy to do since one of the tips is keyed so connector goes in only one way, connect clamps to the corresponding car battery terminal (also easy since cables are colored red and black), wait for booster cable green light indicator (sensor located in series with a ground cable), and start your engine! Upon start up, battery should be able to provide 200A of the current with an in-rush peak current of up to 400A for a short duration of 3 seconds. Make sure to disconnect jumper cable clamps after about 30seconds of operation so you don't drain the battery. This is a very easy and convenient way to jump-start your car without depending on another car with a jumper cable next to you!
Overall, I can't think of a single reason why you wouldn't want to get this jump start battery for every car in your family. It's true that car batteries don't fail as often, but for a piece of mind keeping this battery in your car is priceless! Besides jump starting your car, this is a fully capable 10,000 mAh external battery with dual 2.1A/1A outputs to charge your phone and/or your tablet, and also to provide an emergency light. And if you are or someone next to you in trouble with their car battery, using Anker Car Jump Start battery will be the easiest and the cleanest way to mitigate this problem! This one definitely gets my high recommendation!
Here are the pictures.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

When you tested this was the battery completely drained on the vehicle? I'm impressed with the compact size that it is capable of jumpstarting a vehicle. Nice review

LG V40 Extended Battery Cases

Creating this thread so we can stay updated on possible battery cases being manufactured for this phone. ZeroLemon is a likely candidate. They have produced cases for the LG G series from the G4 through G7, and all of the V series (10 through 30).
I inquired through their Facebook page, and they said they'll think about it. So it sounds like it's not a quite a priority for them yet, but if we get enough people to express interest, maybe we'll see a ZeroLemon for the V40 soon enough.
There's also a manufacturer called "Newdery", who sells battery cases. I have not had any experience with their products, but they did make a battery case for the V30 which seems to have gotten good reviews.
Post here if you guys see any others!

I have the Newdery case for the V20 and one get one for the V40 if they make it. The only minor quibble is not being able to do file/data through the case, so I only use it when traveling and need the battery power for photos.

Just FYI, the V40 will fit in the V20 Newdery case, just no button access (other than the fingerprint scanner) and the flash is cut off.

https://m.aliexpress.com/item/10000...lgo_pvid=b94e4312-0dfe-4914-95c6-62b147436e27
Anybody heard about this brand?

Newdery is a good company i buy a battery for my lg v20 np so far
Sent from my [device_name] using XDA-Developers Legacy app

I'm testing the Newbury case now. Will have a review this weekend.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Sent from my LM-V405 using Tapatalk

Also, if anyone has any questions they they'd like me to discuss in my review, let me know.
Sent from my LM-V405 using Tapatalk

I just submitted my review to Amazon, but that takes time to appear so here's a copy and paste of my 4/5 star review:
Newdery LG V40 Battery case (https://www.amazon.com/gp/product/B07KPYCXCM/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1)
If you don't like having to have your phone tethered to a charger throughout the day, then I would recommend considering this case. It's not convenient for everyone to plug their phone in when they need a recharge, nor is it ideal to lug around a bulky power bank. This phone frees you from having to remember to plug in and it's less bulky than most power banks since it's attached to your phone.
BATTERY LIFE
The battery case offers enough juice to give you more than a full charge. I consider myself a heavy user, and this case provided enough power to last me a full day and then some. I unplug my phone at around 6 AM, then, by the end of my day at around 11 PM, the battery case would be depleted or very nearly so, and my phone's battery would be at 40% or more . Getting through an entire day without having to plug in is the goal, so this case meets and exceeds my battery life expectations.
For my testing, I'd begin charging my phone when it drained to about 40%—to start or stop charging, you hold the button on the back for a few seconds—then I would charge it until it reached about 80%. I'd repeat throughout the day a few times as needed. As already mentioned, by the end of the day, I'd still have about 40% or more battery left in my phone and the case would be either depleted or close to being so. My screen-on-time during my week of testing was between seven and eight hours on average with 40% battery remaining.
These results are comparable to using my phone without the extended battery case in which I'd fully recharge my phone at least once and still end the day at around 40%. Had I been unable to fully charge my phone, though, I would have been at a disadvantage compared to using the always-there extended battery case, so the benefit of using this extended battery case is that it's attached to your phone and is ready to provide a charge as needed without you having to track down a charger.
I didn't really test charging times, but I will point out that if you're charging the case and phone together overnight and you want a full charge, then you'll probably want to make sure you're getting a full eight hours of sleep. The two nights I charged the phone and case together, neither were fully charged when I woke in the morning. On the nights that I charged them separately, they would both be fully charged. This is kind of a non-issue, but it's still worth noting.
BUILD & DESIGN
The extended battery case will add bulk to your phone, but it's less bulky than having to carry around a power bank. I actually just recently upgraded to the V40 from the V30 and I immediately started using the V40 with the battery case, so I had to to get used to a larger phone in addition to the extra bulk. It's still big, but I got used to using the V40 in the case by the end of the week. It helps that I also purchased a Ringke ring grip (https://www.amazon.com/gp/product/B07JV9TT5Y/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1), though sometimes I'd still hold my phone without sliding my finger in the ring for support.
The case doesn't have the best grip, but it's not what I'd call dangerously slippery. A smart design choice would have been to use a material with much more grip so that we could worry less about accidental drops, especially because this case does not inspire confidence when it comes to protection.
I'd say the biggest downside about this case is that I'd be terrified if I dropped my phone while using it. The corners have some protection, but the lip is almost non-existent over the sides of the phone. For this reason, I'd highly recommend something like a ring or pop socket to use while holding your phone. The case itself of good quality, but it wasn't designed with protection in mind.
Aside from that, it has a cool look. Its design reminds me of the Nexus 4. It's bulky but not nearly as bulky as some ZeroLemon cases that I've used in the past. The size is manageable and not too uncomfortable once you get used to it. When it comes to attaching an extended battery to the charging port of your phone, you really can't come up with a better design than this. The only drawbacks are literally the lack of protection and the less-than-desirable grip.
FINAL THOUGHTS
If you are in the market for an extended battery case, then I can recommend this. You already know what you're getting into in terms of size and bulk, and I can attest that the battery life added is more than enough. The only real concern is protection (and why I suggest a pop socket or similar product).
Extended batteries aren't for everyone. If you don't mind having to plug in your phone or dropping it on a wireless charger whenever you need a charge, or if you don't mind having to carry around a power bank, then obviously this isn't the product or review for you. For those of us who don't like to think about charging our phones and don't mind the size, then this is worth considering. Even if it's not used daily, I imagine there are at least some days you'd wish you had it handy.