Develop Bugs

External Batteries

I was just wondering whether external batteries are generally quite reliable, and if so what the best brands are to go for? I am looking for a relatively powerful one - I am not afraid of a little bit of cost, but obviously I don't want to spend masses.
Thanks

Ive got a New Trent and its well built and reliable. The 11000mAH will last you for several days. Have a look on Amazon.

I have a "Just Mobile Pro" or something like that.
4400mAh with 1000mA output.
But the EasyAcc 5600mAh (which I don't have) does sound better and cheaper (on Amazon).

Second new trents 11000mah one that thing is a beast

Chartist said:
Ive got a New Trent and its well built and reliable. The 11000mAH will last you for several days. Have a look on Amazon.
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24inchsub said:
Second new trents 11000mah one that thing is a beast
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Click to collapse
yeah i got that bad boy too and its a beast. well worth the price

Chartist said:
Ive got a New Trent and its well built and reliable. The 11000mAH will last you for several days. Have a look on Amazon.
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Thanks not heard of New Trent before. Looks good. Can you confirm it's output charging current though? I can't find the spec on it anywhere. I'm assuming it's the full 1A, as it says it can charge an iPad, but could you please confirm? Looks like I'll be needing one!
Cheers.

wnp_79 said:
Thanks not heard of New Trent before. Looks good. Can you confirm it's output charging current though? I can't find the spec on it anywhere. I'm assuming it's the full 1A, as it says it can charge an iPad, but could you please confirm? Looks like I'll be needing one!
Cheers.
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Click to collapse
i can try to charge my ipad when i get home haven't tried actually.

I bought the Anker 5600mAh battery for my HTC Desire. Great quality, compact and it fits in my pocket very nicely. I bought it for $30 on ebay
http://www.ianker.com/products_astronew.html

gordongartrell said:
I bought the Anker 5600mAh battery for my HTC Desire. Great quality, compact and it fits in my pocket very nicely. I bought it for $30 on ebay
http://www.ianker.com/products_astronew.html
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Click to collapse
Flashlight feature's a nice touch.

isound portable external battery. Has built in flashlight too. Comes in two flavors, 16000mah and 8000mah.
If you look around you can find it cheaper elsewhere
http://www.isound.net/shop-by-type/accessories/i-sound-portable-power-16000-mah.html
Zagg Sparq 2.0 6000mah. Not worth the $100. Went on sale for $50 before..
Love the design and its built it power plugs. Loses charge over time. Google user reviews.
http://www.zagg.com/accessories/zaggsparq.php

knoxploration said:
Flashlight feature's a nice touch.
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Click to collapse
It's good and bad . I was on the train heading home from work and I was charging my phone with the Anker charger. I accidentally pressed the power button twice and the flashlight turned on. Sitting across from me was this fairly attractive woman with a skirt on. She automatically crossed her legs and looked at me weird. I hope she doesn't think that i'm a pervert.

gordongartrell said:
It's good and bad . I was on the train heading home from work and I was charging my phone with the Anker charger. I accidentally pressed the power button twice and the flashlight turned on. Sitting across from me was this fairly attractive woman with a skirt on. She automatically crossed her legs and looked at me weird. I hope she doesn't think that i'm a pervert.
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Click to collapse
Hah! Good thing I didn't have a mouthful of soda there...

Good thing to remember with external battery packs is that during usage some of the charge goes to charging the battery while some is lost in heat. I think I read some where its normaly 30-40%. So for example a 11000mah battery will give you some where near 6600mah of charge so about 3 and half charges of the HTC One X.
I'm considering either the:
TeckNet® iEP387 7000mAh Dual-Port 2.1Amp Output Universal USB Battery Bank
http://www.amazon.co.uk/gp/product/...&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294
New Trent iCruiser IMP1000 11000mAh External Battery Pack
http://www.amazon.co.uk/gp/product/...&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294
Although not 100% sure I need either at the moment

HTC-Gunge said:
Good thing to remember with external battery packs is that during usage some of the charge goes to charging the battery while some is lost in heat. I think I read some where its normaly 30-40%. So for example a 11000mah battery will give you some where near 6600mah of charge so about 3 and half charges of the HTC One X.
I'm considering either the:
TeckNet® iEP387 7000mAh Dual-Port 2.1Amp Output Universal USB Battery Bank
http://www.amazon.co.uk/gp/product/...&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294
New Trent iCruiser IMP1000 11000mAh External Battery Pack
http://www.amazon.co.uk/gp/product/...&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294
Although not 100% sure I need either at the moment
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Click to collapse
The heat loss is inevitable but the capacity should be unchanged.
What the heat loss means is that you need more than 11000mAh to charge up the full 11000mAh battery due to the losses.
The tecknet is very good value. I am considering it at the moment

tsleng said:
The heat loss is inevitable but the capacity should be unchanged.
What the heat loss means is that you need more than 11000mAh to charge up the full 11000mAh battery due to the losses.
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Click to collapse
Yes but I'm talking about in the other direction. So once you have 11000mAh in the device and you charge a device that take 1800mAh you will actually use aprox 2520mAh in doing so. My numbers and calculations maybe a little flawed but my point is that you cant do a simple 11000 / 1800 = 6.1 charges as you need to take into account heat loss which is around 30 - 40% (so I read on one of the amazon reviews)
Either way both devices are nice and cost quite reasonable.

Hampa_D said:
i can try to charge my ipad when i get home haven't tried actually.
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tried it with my ipad last night and it worked great, it worked as if it was on AC

Have got the Tecknet IEP987 7000mah battery myself. Has run through two charges of a sensation XL and my Fiio Headphone amp, and still around half full.
Am more than happy with it.

HTC-Gunge said:
Yes but I'm talking about in the other direction. So once you have 11000mAh in the device and you charge a device that take 1800mAh you will actually use aprox 2520mAh in doing so. My numbers and calculations maybe a little flawed but my point is that you cant do a simple 11000 / 1800 = 6.1 charges as you need to take into account heat loss which is around 30 - 40% (so I read on one of the amazon reviews)
Either way both devices are nice and cost quite reasonable.
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Click to collapse
Ah yes of course. Did not realise you were talking about the other way round charger>>phone
Not sure how efficient but if say 10% loss, we still get around 5 times charge with a 11000mAh batt. to a One X.
I am leaning towards the 7000mAh. Not sure if I need it or not...

tsleng said:
Ah yes of course. Did not realise you were talking about the other way round charger>>phone
Not sure how efficient but if say 10% loss, we still get around 5 times charge with a 11000mAh batt. to a One X.
I am leaning towards the 7000mAh. Not sure if I need it or not...
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Click to collapse
Also don't forgot not to simply divide the battery pack's capacity by your phone's battery capacity to see how many times it will charge, unless you are charging it with the phone turned off.
With the phone on it is obviously using the usual amount for running the phone, whilst it is being charged. Add the current being drawn for keeping the phone running (say 250mA when awake) for the time it takes to charge (for me 2 hours) and you are looking at 500mAH. Add that to the capacity of your phone battery before dividing it by the capacity of your battery pack to figure out how many charges you'll get from it. Figures used are just for example purposes. Use a current widget if you want to know how much your phone is using.
Plus like a phone's battery, a new battery pack will take several charge cycles to reach full performance. Where as with a phone's battery which only takes about 2 weeks (charging it every day), a battery pack will take that much longer to get the full performance out of, as you wont likely be charging it more than once a week/month.
And then there's the battery indicators. These New Trent ones look sensible, but I once purchased a Proporta Turbocharger 5000mAHr unit. It had three blue LED battery status lights that were always on if charging. If you looked directly at them they'd burn your retinas out your skull. They could be seen from space. Stupidly and comically bright. They HAD to eat into some of the capacity.
Copper losses over the cable at the distances involved in your average charging cable will be negligible. If you really want to reduce it, don't use those silly skinny retracting yo-yo charging cable things that some of them come with. Use a decent quality USB to microUSB cable. The higher the guage of the cable and quality of copper, the less volt-drop there is. I keep a good few of these kicking about at home as they are well made but not too costly, and come with a nice cable tidy clasp...http://www.ebay.co.uk/itm/GENUINE-NOKIA-CA-101-CA101-USB-DATA-CABLE-LEAD-5230-/140579882085?pt=UK_MobilePhones_MobilePhoneAccesories_MobilePhoneDataCables_JN&hash=item20bb36c465

fi3ry_icy said:
since the battery isnt gonna be removable, i am currently considering buying a portable charger..
here are some i found.. would like an opinion on which capacity would be good..
http://www.netimes.com/shop/power-master-9600mah-portable-mobile-power-p-3052.html?cPath=445_711
http://www.netimes.com/shop/2000mah...pack-with-led-light-p-3264.html?cPath=445_711
http://www.netimes.com/shop/dualport-5000mah-external-battery-pack-p-3109.html?cPath=80_731
http://mobilemate.yetaa.com/accessories/pineng-5000mah-power-bank.html
the last link has the same capacity as the 2nd last but it is way cheaper.. is it safe?
Click to expand...
Click to collapse
here u go..
posted this in another thread..
cheers..

[Q] Can different chargers mess with your battery?

So i recently busted my default charger and started using one i bought, its not samsung brand, but lately i've been noticing that my battery dies quicker, does this seem look like normal battery life or is it possible that having a different type of charger is screwing with my battery? All i use my phone for is texting/phone calls. Thanks in advance

What are the power output on the charger? It seems that it drops really fast even during standby. The charger that came with the nexus is rated at 5v @ 1a.

SnackAttackk said:
So i recently busted my default charger and started using one i bought, its not samsung brand, but lately i've been noticing that my battery dies quicker, does this seem look like normal battery life or is it possible that having a different type of charger is screwing with my battery? All i use my phone for is texting/phone calls. Thanks in advance
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Click to collapse
Have you checked BetterBatteryStats? Looks like that phone is almost always awake, except during one period where the battery had less of a downslope. Also, it looks like even during the downslopes your phone is charging. Something doesn't seem right here, and I doubt it's your charger. It looks more like some application or other software is eating your battery for breakfast.

Yeah i also forgot to say, sometimes i'd look at my phone while in out and it would randomly say its charging. When its obviously not. The brand of the charger is called "On the go", no idea what kind of charge it delivers.

SnackAttackk said:
Yeah i also forgot to say, sometimes i'd look at my phone while in out and it would randomly say its charging. When its obviously not. The brand of the charger is called "On the go", no idea what kind of charge it delivers.
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Click to collapse
Are you on stock or have you tried flashing back to stock? If the problem continues even with a clean install of the stock software, it seems like the USB charging board might be messed up and may need replacing.

biscuitownz said:
What are the power output on the charger? It seems that it drops really fast even during standby. The charger that came with the nexus is rated at 5v @ 1a.
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Click to collapse
I've always wondered about this too. I seem to have a range of chargers that are micro USB that are 5v but < 1a. Is it safe to use these or not?

Yes i flashed it and am on a rooted version.

JaiaV said:
If the problem continues even with a clean install of the stock software, it seems like the USB charging board might be messed up and may need replacing.
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Click to collapse
^^^^^^^

Alright i'll look into that, thanks guys

I'm Curious About This Too
I've been using the power block from my old Motorola OG Droid, with an output of 5.1V - 850mA, along with the usb cable that came with my old Palm Pre Plus (its nearly 52" long, almost 4 1/2ft!) andi have no idea what that's rated for. I seem to be doing fine as far as I can tell. It charges quickly on AC, nothing overheats.
But what are the consequences of using a power source with this kind of difference, if any? Consequences to using a power source with a greater difference?

neccoguy21 said:
I've been using the power block from my old Motorola OG Droid, with an output of 5.1V - 850mA, along with the usb cable that came with my old Palm Pre Plus (its nearly 52" long, almost 4 1/2ft!) andi have no idea what that's rated for. I seem to be doing fine as far as I can tell. It charges quickly on AC, nothing overheats.
But what are the consequences of using a power source with this kind of difference, if any? Consequences to using a power source with a greater difference?
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Click to collapse
Not saying it works but my friends phone was doing same phone kept saying it was still charging and screen wouldn't sleep , are u using a live wallpaper ? If u are try getting something non live and see if that helps . His phone since has stopped showing the charging icon and screen wake has reduced dramatically
Sent from my Galaxy Nexus using xda premium

benpfeil said:
I've always wondered about this too. I seem to have a range of chargers that are micro USB that are 5v but < 1a. Is it safe to use these or not?
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Yes, the "a" (amperage) doesn't matter. It's just telling you how fast it can charge your phone, higher the amperage is, the faster it'll charge.
You can also determine how many watts the charger will consume by multiplying the Voltage by Amps. So if your charger was rated at 5v @ 1.5a, it will use about 7.5 watts. If it's less than 1a, like .6a, just put a decimal before the number.

QI Charger/Power Bank

I wanted to get QI charger w/ my Nexus and ended up getting one that included a 10,000 mAh powerbank for basically the same price.
I thought it was going to feel pretty cheap, but to my surprise it seems like its pretty good quality. For 40 bucks for both a QI and a power bank in one it's pretty kick arse! So be forewarned the "IN STOCK" status is BS it ships from China so don't expect within a week; I think I got mine in 3 weeks.
Also the instructions are horrendous, not sure who translated it but its actually comedy. I think says something like... "Use it if it bulges, smells or smokes." (instead of dont) and has FAQ's that have no questions. Literally every line in the instructions does not make sense.
So you can use this as a normal QI charger. As a powerbank you can use QI or plug it in through the USB ports (2) which makes more sense so you dont have 30% power loss as with QI. Powerbank is same shape as phone just about twice as thick and slightly larger width and length. Finished material is smooth so if you have a hard plastic case it may easily slide off or not become centered well enough to charge. I have a case no issues charging through the case. It does also get a full charge and it does not get my phone more than warm (same as wall charger).
http://www.amazon.com/gp/product/B00FS1NTMW/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
*not much but you can save a little here:
forgot to mention you can Save 5% on Qi Wireless Charger Transmitter 10000mAh Mobile Power Bank(ASIN:B00FS1NTMW) when you purchase 1 or more Qi Standard Wireless Charging Receiver offered by Docooler. Enter code 3VYHPR39 at checkout.
Enter code 3VYHPR39

I'd be very interested in a test to see what the actual capacity of this is. Im always wary with a no name brand battery from China because they tend to always overstate their battery capacities. Wish there were some reviews, but I might give it a go anyway to test it out myself.

Looks interesting, but the lack of reviews make it sound dubious

loooller said:
Looks interesting, but the lack of reviews make it sound dubious
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Its weird how almost all of the qi power banks on amazon have no reviews. Seems like something everyone should have. Ridiculously useful. I am wondering why the one posted above is a good 25% cheaper than all the others of the same 10,000 mah capacity though.
Would absolutely love for the OP to test how many full charges of the Nexus 5 he could get from the device using USB and then Wireless charging, but that would probably take a while. Also OP, when you say that the case is smooth, is it smooth like the soft touch plastic on the back of the Nexus 5 or smooth like the shiny plastic on galaxy phones?

I'm waiting for RavPower Qi Wireless Charging Pad with a built-in 4800mAh battery coming back in stock. It seems like a great fit with my Nexus 5 as I checked a review from WPCentral.

Ordered one
Just ordered one. Will let you guys know when I get it, what it's like!

muyoso said:
Would absolutely love for the OP to test how many full charges of the Nexus 5 he could get from the device using USB and then Wireless charging, but that would probably take a while. Also OP, when you say that the case is smooth, is it smooth like the soft touch plastic on the back of the Nexus 5 or smooth like the shiny plastic on galaxy phones?
Click to expand...
Click to collapse
no problem but may be a few days I'm getting over a day cycle on my nexus so far. I bought it mostly for the QI charger the bank was a bonus/ I will keep a log but try and get full cycles out of it to make it easier.
As far as the smoothness it is more like the shiny plastic on the galaxy phones. My phone has a plastic case it doesn't slide to much but I could see if it got bumped it would move. I had bought a screen protector someone posted that i don't like it's kind of rubbery or tacky feel i was thinking about taking it off and putting it on the charger so it was a little more "grippy".
Give me a few days I'll put up some stats for you

muyoso said:
I'd be very interested in a test to see what the actual capacity of this is. Im always wary with a no name brand battery from China because they tend to always overstate their battery capacities. Wish there were some reviews, but I might give it a go anyway to test it out myself.
Click to expand...
Click to collapse
PS They ALL come from China lol

jeremykersh said:
PS They ALL come from China lol
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Click to collapse
Oh I know, but the ones sold under the badge of Samsung or LG are usually dead on their mah capacity ratings. Not so much for random Chinese brands I havent heard of before.

Hindo2 said:
I'm waiting for RavPower Qi Wireless Charging Pad with a built-in 4800mAh battery coming back in stock. It seems like a great fit with my Nexus 5 as I checked a review from WPCentral.
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Click to collapse
Amazons having a 50% off deal on battery packs if you buy the RAVpower qi charger. I just picked up the charger and a RAV 8400mAh pack for just over 60 bucks. I've been wanting both for a while now and this deal was just to good to pass up. I do a lot of backpacking and have been debating between a battery pack vs. a solar charger for some time now as well. The pack is actually lighter than any of the solar charges I was looking at. And for 18 bucks was a no brainer.

so here are some stats on this as a power bank not sure how much power loss over a few days is normal but after a full charge of the bank using the cable here is what I came up with:
night one charger started at 51% .49 of the full 2300 mAh nexus 5 battery = 1127 mAh
night two started at 18% .82 = 1886
night three started at 22% .78 = 1794
night four started at 28% .72 = 1656
night five started at 9% died at 32% = 529
______________________________________________________________________
TOTAL mAh= 6992

jeremykersh said:
so here are some stats on this as a power bank not sure how much power loss over a few days is normal but after a full charge of the bank using the cable here is what I came up with:
night one charger started at 51% .49 of the full 2300 mAh nexus 5 battery = 1127 mAh
night two started at 18% .82 = 1886
night three started at 22% .78 = 1794
night four started at 28% .72 = 1656
night five started at 9% died at 32% = 529
______________________________________________________________________
TOTAL mAh= 6992
Click to expand...
Click to collapse
Interesting. And that is using the cable and not the Qi wireless charging? Its always said that Qi will have around a 30% loss in efficiency, which would make your numbers perfectly in line with what a 10,000 mah battery should do. Of course if you were using a cable it might just be that the low cost of the device translates to a less efficient transfer of energy. Still able to get roughly 3 full charges out of the power bank is pretty awesome.

muyoso said:
Interesting. And that is using the cable and not the Qi wireless charging? Its always said that Qi will have around a 30% loss in efficiency, which would make your numbers perfectly in line with what a 10,000 mah battery should do. Of course if you were using a cable it might just be that the low cost of the device translates to a less efficient transfer of energy. Still able to get roughly 3 full charges out of the power bank is pretty awesome.
Click to expand...
Click to collapse
Yea thats through the cable, I know even turned off there is power loss on rechargeable batteries but I don't know what is normal power degradation equates to in a percentage. I agree though roughly 3 full charges may not be a full 10,000 mAh bank, but at the price even if it equates to a 7000 bank its not bad. Throw in the QI (which is mainly what I bought this for anyway) and this is pretty sweet deal :laugh:
I'll do it again and see what I come up with for round 2

Does it have an auto shut off function?
Sent from my SAMSUNG-SGH-T989 using xda app-developers app

mierkat09 said:
Does it have an auto shut off function?
Sent from my SAMSUNG-SGH-T989 using xda app-developers app
Click to expand...
Click to collapse
it does shut off once it gets a full charge, using the cable as a powerbank. Never tried QI as a bank doesn't make sense so don't know this way.

Need LG V20 Battery Charging Cradle (BCK-5200) (INDIA)

Hi,
Can anyone help me to find where I will get LG V20 Battery Charging Cradle in India. I asked LG service center also. They don't have any accessories.

ksmk1006 said:
Hi,
Can anyone help me to find where I will get LG V20 Battery Charging Cradle in India. I asked LG service center also. They don't have any accessories.
Click to expand...
Click to collapse
Do you have access to Amazon in India? I know they have a few on there. At least in the US they do.
Sent from my LG V20 using XDA Labs

Hello friend, in Brazil we also do not have the charger, nor the device v20, but I got to buy on ebay , searching for LG V20 Mobile Battery Charging Kit BCK-5200 w Hybrid Charger Case BCK5200

I saw a couple versions on Wish.com. One just a cradle, the other had a slot for a back up battery. That being said, now I am looking for a reasonably priced OEM battery. Suggestions? Also, I have not dug around yet I the setting or wherever, but does the V20 support NFC charging?

I just ordered one from eBay global easy buy. It costs Rs. 4490/- including shipping..
Seller id is : i2cworld_inc3..

UncleScoopy said:
I saw a couple versions on Wish.com. One just a cradle, the other had a slot for a back up battery. That being said, now I am looking for a reasonably priced OEM battery. Suggestions? Also, I have not dug around yet I the setting or wherever, but does the V20 support NFC charging?
Click to expand...
Click to collapse
If you mean wireless charging, then no. I just got one for a family member yesterday and did research. There are pins for it inside the back panel, but LG never released a wireless charging back. There are cheesy third-party stickers that attach to the USB at the bottom, but they look awful.

ksmk1006 said:
Hi,
Can anyone help me to find where I will get LG V20 Battery Charging Cradle in India. I asked LG service center also. They don't have any accessories.
Click to expand...
Click to collapse
I have an spare kit. If you want DM me!

cheap battery charging cradle
I received a $2.52 charging cradle from aliexpress ( https://www.aliexpress.com/item/Mic...ck-Holder-Desktop-For-LG-V20/32819373073.html ) yesterday. I tested it : powered it on my network hub usb port, put my battery in it, it charged it from about 75% to 100% in about an hour or less ... seems to be (very) fine for the price - Hope this helps

Just out of interest, how long do people find that it takes to fully charge their batteries with the official cradle? I normally take out the battery and swap mine for a fully charged one at about 15%, so if anyone could let me know their charging times, that would be great! I'm currently using a cheap universal battery charging cradle.
Also, when you put the battery in the phone, what does it show up at - mine is normally around 95%.
*edit* I finally found one and, so far, so good!

woldranger said:
Just out of interest, how long do people find that it takes to fully charge their batteries with the official cradle? I normally take out the battery and swap mine for a fully charged one at about 15%, so if anyone could let me know their charging times, that would be great! I'm currently using a cheap universal battery charging cradle.
Also, when you put the battery in the phone, what does it show up at - mine is normally around 95%.
*edit* I finally found one and, so far, so good!
Click to expand...
Click to collapse
The output says 4.4V at 1.6A so that's about 7W going in
Battery is 3200mah or 12.3Wh
2-3h for a full charge and it should say 100% when fully charged

Chinese battery cases

Anybody try any of the ~$15 battery cases on eBay from China? About 10 listings pop-up without trying, but all seem to be the same, from the description anyway... Just seems like for the money if it even extends battery life 50% it is a bargain.
http://www.ebay.com/itm/3800mAh-Por...Bank-Charger-Case-For-LG-Nexus-5/182408839882
100% brand new, high quality
Suitable for: For LG Google Nexus 5
Capacity: 3800mAh
Input: 5V / 500mA
Output: 5V / 800mA
Color: Black
Feature:
It can stand up
Charging/sync, simply plug in the usb turn micro usb to the micro usb female dock, connect the usb to a powered usb equipment or computer.
Compatible Perfect with new For LG Google Nexus 5
Package:
1 x 3800mAh external battery case For LG Google Nexus 5
EDIT: eh, it was $14 so went ahead and ordered one, will report back in a few weeks.

Very interested in hearing back about this. Bought a new phone for Dad so I am going to reuse his old nexus 5 as a second phone. Will try to pimp it out and the first thing I need is exactly this. Been researching on "larger batteries" (all fake lol) but I believe this is the next best thing.

Any news on this? Seem very interesting. Will also buy a new battery, but this will be better than the LG G2 battery mod.

fleischbanane said:
Any news on this? Seem very interesting. Will also buy a new battery, but this will be better than the LG G2 battery mod.
Click to expand...
Click to collapse
Sorry... Forgot about this thread. The battery case worked fine although I didn't get to test it much as I sold the phone and case a couple weeks later to a guy in rough spot for next to nothing. He is still using it a few months later with no problems.

I got one of this and I rather use power bank to charge it
Cons:
Little to no protection on the phone, I have to cut a rubber case in order to use it
No pass-through charging. The case itself will NOT charge when your phone is in the case. At the end, you got 100% on your phone but 0% in the case, even you have already plugged in. So if you need to charge both devices, you have to take them apart and charge them seperately.
Slow charge rate, the case charges N5 slow when you are using it at the same time, so the juice perecentage will probably still drop, but slower.
Heat. This thing is warm or even hot when operating under heavy usage. With its build quality, I did worry about something bad could happen.
Comment:
It is not so good and the build quality is also average. But since it is the only battery case that we can buy after 3 years, it is still useful as a backup battery. Just don't use the phone heavily on the go when the case is chaging your phone. (That's why I switched back to power bank…)