Develop Bugs

2A vs. 1A charger

In the meantime I got inspired by some threads in which people claimed that 2A (amp) charger will make it faster to charge up my note then original 1A charger. I bought original Samsung 2A charger for Samsung galaxy tab and tried that out and I must say that during the first week or two the charging time decreased from around 2.5 - 3 hours into something around 1h 40-50 min.
Later on everything returned to standard 3 hours though, charging with 2A charger is almost identical to 1A charger so from my experience there is no added value with this approach (unless ICS will make a change, or some custom rom).
For anyone interested I enclosed picture where in the top row you may see charging with 1A charger after 1h50min, 2h40min (both just random pics), then when this app (https://market.android.com/details?id=net.whph.android.battery) said it is 100% and the last picture is when galaxy note (Android) system said it is 100% (green battery icon). In the bottom row there is the same scenario with 2A charger. I am on the stock rom 2.6.35.7-N7000XXKKA.

Im not sure but I think you need a kernel that allows more than 1A charging for the 2A charger to work.

EarlZ said:
Im not sure but I think you need a kernel that allows more than 1A charging for the 2A charger to work.
Click to expand...
Click to collapse
I guess so, what makes me slightly uncertain is that initially, charging time was around 2 hours ...

This is an interesting thread. I'd like to get more information about 2A chargers and whether they really make a difference.
Also I heard that when plugged to a TV (using the MHL cable) the phone may actually consume the battery more, even when plugged to the charger simultaneously. therefore if 2A chargers charge faster, it may also solve this problem.

Qvp said:
This is an interesting thread. I'd like to get more information about 2A chargers and whether they really make a difference.
Also I heard that when plugged to a TV (using the MHL cable) the phone may actually consume the battery more, even when plugged to the charger simultaneously. therefore if 2A chargers charge faster, it may also solve this problem.
Click to expand...
Click to collapse
I actually have both, micro USB to USB and micro USB to MHL cables. Wasn't able to test them for a longer time as they sometimes work and sometimes don't, especially mhl cable shows videos for like 30 seconds and then there is a lost signal message on my TV, then it wakes up, then it is gone again ... I could fiddle wit it, but will rather wait for ICS upgrade and then will return to it again.
Sent from my SGN

Iphone charger
I am using the iPhone charger. It is a 2A and so far I see an improvement in the battery life. With the original charger (and BB one) the battery reading was 2100mAh . Now is 2600mAh. I don't know why or how.
Also I see a sightly improvement in how the battery lasts for normal use. I get around 18hours

antonioeram said:
I am using the iPhone charger. It is a 2A and so far I see an improvement in the battery life. With the original charger (and BB one) the battery reading was 2100mAh . Now is 2600mAh. I don't know why or how.
Also I see a sightly improvement in how the battery lasts for normal use. I get around 18hours
Click to expand...
Click to collapse
the iPhone charger is 1a... Only the ipad charger is 2a
Sent from my Galaxy Nexus

What we need is someone with 2 notes with dead batteries and plug the original charger 1a on one and a 2a charger on the other and see which one gets fully charged first! Maybe its me but I can definitely see a difference between the original and the one I'm using (playbook charger 1.8a)
Sent from my Galaxy Nexus

big samm said:
What we need is someone with 2 notes with dead batteries and plug the original charger 1a on one and a 2a charger on the other and see which one gets fully charged first! Maybe its me but I can definitely see a difference between the original and the one I'm using (playbook charger 1.8a)
Sent from my Galaxy Nexus
Click to expand...
Click to collapse
I did it, and while not with 2 notes side by side, you can have a look at the pictures at the 1st post, the time and charging rate shows its pretty same on the stock rom whether you use 1A or 2A charger. (Although it was very different first one or two weeks, after that battery get used to 2A charger and charging is as slow as with 1A ...)

antonioeram said:
I am using the iPhone charger. It is a 2A and so far I see an improvement in the battery life. With the original charger (and BB one) the battery reading was 2100mAh . Now is 2600mAh. I don't know why or how.
Also I see a sightly improvement in how the battery lasts for normal use. I get around 18hours
Click to expand...
Click to collapse
How did you measure the current in mAh or what app did you use? Thanks.

My bad. I am using the iPad chargers. not iPhone . Those are 2A. To verify I am using battery pro monitor.
Here is a screenshot.
Sent from my GT-N7000 using XDA

SGN stock batt with ipad charger?
Hi, I see some of you are using 2A/ipad charger to charge you SGN. My question is, will there be any side effects on that could harm the stock batt in short or long run?
FYI, atm, I have an ipad charger for home and car and i intend to just use the same charger to charge all devices including my SGN. Im not looking for a fast charging option, but just a hassle free and conveniences.
I appreciate if you could give suggestion on a dual port charger (for home and car) where I can charge my devices simultaneously at one time.

No harm as long as the volatage output from your charger is 5v. This is what pushes the current to ur device. Higher it goes more it pushes.
However the current that the charger provides decides how fast it can charge. This will also depend on the device. If the device is manufactured to charge at 1 amp and u use a 2 amp charger then it will only use 1amp. If however u use a 750mah charger it can only use 750mah and charge slowly.
@Taptalk-GalaxyNote

samsung's charger with 2.0A. can i use it for sgs3?

I got an original Samsung charger, looks just like the original charger I have for the SGS3 (same shape, cable & everything).
only difference is the output on it is 2.0A, while the output for my charger is 1.0A.
will it make a difference if i use this charger for my SGS3? just in case it can blowup the phone or something

666pluto said:
I got an original Samsung charger, looks just like the original charger I have for the SGS3 (same shape, cable & everything).
only difference is the output on it is 2.0A, while the output for my charger is 1.0A.
will it make a difference if i use this charger for my SGS3? just in case it can blowup the phone or something
Click to expand...
Click to collapse
No problem if the output is Always 5V.
2.0A only means the max power the Charger can send out. If the phone request max 1.0A, then the charger give it 1.0A. No difference in charging time, no difference at all.:good:

666pluto said:
I got an original Samsung charger, looks just like the original charger I have for the SGS3 (same shape, cable & everything).
only difference is the output on it is 2.0A, while the output for my charger is 1.0A.
will it make a difference if i use this charger for my SGS3? just in case it can blowup the phone or something
Click to expand...
Click to collapse
Well my fellow Israeli, I'm using 2.0A and it's been great so far.
Bought it in a "private store" and they gave me a 0.7 A charger. So after moving from 0.7A to 2.0A it did made a noticeable difference.
By the way, the 1.0A limit can be changed with a custom Kernel. Such as*Boeffla Kernel.
Sent from my GT-I9300 using XDA Premium 4 mobile app

Better than the stock S3 charger. I'm using 2.1A charger. Charges up my S3 so fast. It charges 65% in 20 mins

QIQgame said:
Well my fellow Israeli, I'm using 2.0A and it's been great so far.
Bought it in a "private store" and they gave me a 0.7 A charger. So after moving from 0.7A to 2.0A it did made a noticeable difference.
By the way, the 1.0A limit can be changed with a custom Kernel. Such as*Boeffla Kernel.
Sent from my GT-I9300 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
about the limit change, is it safe to play with such an option? didn't they place this limit for a reason?
but out of interest, how much faster can you make it charge if you change the limit?

Fast charging your battery is very similar to overclocking your cores. If it draws higher amperage and the temperature goes up it will shorten the life of the battery. Slower charging keeps the temperature low and lengthens battery lifespan.
Fast charge w/ High amps = High temps, charges fast, & shortens battery lifespan
Normal charge = Low temps, normal charge speed, & longer battery lifespan
Bottom-line, if you don't mind getting a new battery and want to charge your phone quickly, enable fast charge.

666pluto said:
about the limit change, is it safe to play with such an option? didn't they place this limit for a reason?
but out of interest, how much faster can you make it charge if you change the limit?
Click to expand...
Click to collapse
I agree with my friend up above me.
pretty sure that over heating your battery will degrade the battery's chemicals & with time your maximum capacity will decrease.
My personal routine is using another 2 Zero Lemon spare batteries with their external slow charger (0.6 A).
always got a spare in my wallet and it is saved from a possible "memory effect" syndrome which shouldn't be excited in lithium ion batteries, but a recent study by a Japanese guy shows signs of a memory effect.
No idea how much time I save by fast charging. I'll time it next charge for you.
Sent from my GT-I9300 using XDA Premium 4 mobile app

Where can i get this charger?
Hey guys,
can you tell me, where i can get this 2A-charger for my S3? Preferably with a german plug...
Regards
Clark

Clark789 said:
Hey guys,
can you tell me, where i can get this 2A-charger for my S3? Preferably with a german plug...
Regards
Clark
Click to expand...
Click to collapse
there's no 2A charger for the S3. the one i have was originally for note 2 or something, i forgot. but you can charge the S3 with it...
if you have a regular 1A charger, then don't worry about it, it's the same basically

S3 is coded in the kernel to only charge at 1000ma.
You can override these settings with some kernels, but I wouldn't. Frying charging circuits are quite annoying.

It's for the S4. Note 2 chargers were black like ours.
Sent from my GT-I9300 using xda app-developers app

Faster Wall Charger (Updated with results)

Hello Everyone,
I wanted a faster and better charger for my Nexus 5. After doing some research I came up with the following possibilities:
From Amazon:
http://www.amazon.com/Tech-Armor-Charger-Watts-Black/dp/B00CD0HGDE
http://www.amazon.com/iXCC-Charger-Charging-Samsung-Package/dp/B00FCISG6K
http://www.amazon.com/EZOPower-Charger-Adapter-Smartphone-Cellphone/dp/B00EDU5X6Y
All these chargers have 2 USB ports, which they are great if you need to charge two devices at once. They will charge 2.1A from one port and 1A from the other. My problem with all these is that they are bulky and two of them have ports that come out of the back. It can be difficult to use if you want to plug your charger lets say behind your bed or similar tight places. That is one of the reasons why I don't like the stock Nexus 5 charger as the USB cable comes out of the back and its only 1.2A
From eBay:
http://www.ebay.com/itm/OEM-BlackBe...o-USB-Compatible-Phones-Tablets-/200976069483
This charger is exactly what I'm looking for because its small, the cable comes out of the side, and the output is 1.8A which is greater than the stock Nexus 5 charger. Plus at $3.99 & free shipping for a new charger is not a bad deal. Since this is an OEM Blackberry product the quality is excellent. Cable is around 7ft long.
Bought me two of them, one for the office and one for home.
Will post my results as soon as I receive the charger. Will test how much current the Nexus 5 can pull.
Update with results:
http://forum.xda-developers.com/showpost.php?p=47468074&postcount=22
Update 2nd test:
http://forum.xda-developers.com/showpost.php?p=47501470&postcount=24
.

Won't phones and batteries only pull the number of amps they are designed to pull? I didn't think it mattered how many amps a charger could proveide as long as it has enough?

Evo_Shift said:
Won't phones and batteries only pull the number of amps they are designed to pull? I didn't think it mattered how many amps a charger could proveide as long as it has enough?
Click to expand...
Click to collapse
I had tablets chargers that I would use on my Nexus 4 and the phone would charge a lot faster than the stock charger that came with it. I'll do some testing and will report my conclusion once I receive it.

The Galaxy S4 charger works great and really fast.

Meh, the stock charger is 1.2A so that's what I figure the fastest it will charge.
I had an SGS3 and using my dad's Note 2's 2A charger, I was still only drawing out 1A, which is what the SGS3's charger came with.

The Nexus 5 comes with a 1.2 amp charger. I HIGHLY doubt it's actually capable of charging any faster than that (it'd be a lot of heat for such a small device).

Charging amperage is specified by the device not the charger. Value on a charger is the maximum amperage it is able to produce. This means that Nexus 4 or 5 will not get more than 1.2A even from a 2A charger.

If the phone is designed to charge at 1.2A, it will charge at 1.2A max. HOWEVER, not all chargers are 100% efficient. That means your phone may not charge at a constant 1.2A through the stock charger if it is not 100% efficient. That is why you notice faster charging speeds using a 2A charger.
If you don't believe me, get an app like battery monitor widget and look at the power input when you are charging.
This is what I use: http://www.amazon.com/Anker®-Dual-Port-Charger-Samsung-Motorola/dp/B00B8L36A6
Anker is a very good brand

cgg123321 said:
If the phone is designed to charge at 1.2A, it will charge at 1.2A max. HOWEVER, not all chargers are 100% efficient. That means your phone may not charge at a constant 1.2A through the stock charger if it is not 100% efficient. That is why you notice faster charging speeds using a 2A charger.
If you don't believe me, get an app like battery monitor widget and look at the power input when you are charging.
This is what I use: http://www.amazon.com/Anker®-Dual-Port-Charger-Samsung-Motorola/dp/B00B8L36A6
Anker is a very good brand
Click to expand...
Click to collapse
My Nexus 5 charges quickly with the charger that it came with. It is 1.2A. I purchased a new car charger that is also 1.2A now. It seems to work well.

mobileboost said:
My Nexus 5 charges quickly with the charger that it came with. It is 1.2A. I purchased a new car charger that is also 1.2A now. It seems to work well.
Click to expand...
Click to collapse
I actually just got my nexus 5 today so I can't comment on the included charger. I was talking about my old galaxy note and htc desire. There was a site that reviewed the efficiency of chargers but I forgot the name of the site.

I use my Nexus 7 charger (2A) and it charges way faster than the stock. They are only $15 on amazon too.

My HP chrome book has a charger rated at 3 amps. Charges the phone crazy fast. I remember seeing these threads and how people said it doesn't matter what the output is blah blah blah. It works. I just wonder what effect it has on the battery? I think its supposed to last longer if you charge it slowly correct?

I use nexus 7 charger. Takes around 15 min to fully charge at 70 percent
Sent from my Nexus 5 using XDA Premium 4 mobile app

Everyone is saying "its faster" but nobody has bothered to mention what faster is.
From 15%, I saw 100% charge in just 2 hours with Qi so I think these phones charge fast in general since Qi is only 1 am output.
If we could stick to real #s going forward then this thread would have some value.
First establishing some baselines with stock charger is essential. Also remember only some fuel gauges support actual current measuring and many apps attempt to calculate current by looking at voltage over time.
Sent from my Nexus 5 using xda app-developers app

kepapas said:
I use nexus 7 charger. Takes around 15 min to fully charge at 70 percent
Sent from my Nexus 5 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Thanks...since I left my N5 charger in a hotel (!) I was having trouble finding a replacement 1.2a charger. So gave up that hunt and just got the Nexus 7 charger on Amazon.

sluflyer06 said:
Everyone is saying "its faster" but nobody has bothered to mention what faster is.
From 15%, I saw 100% charge in just 2 hours with Qi so I think these phones charge fast in general since Qi is only 1 am output.
If we could stick to real #s going forward then this thread would have some value.
First establishing some baselines with stock charger is essential. Also remember only some fuel gauges support actual current measuring and many apps attempt to calculate current by looking at voltage over time.
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
We don't need no stinkin' science in here!
A lot of people just assume their phone is charging faster because they're using a faster charger. Placebo at work.
Folks, if you want to properly determine whether a charger over 1.2 amps is worthwhile you need to do a proper test and remove all the variables:
1. Put the phone in airplane mode and shut down all apps and services. Best if you do this from a clean factory reset so the tests are on equal footing. Any apps using the phone will draw on the battery and influence the test negatively for that charger.
2. Up to 15 minute charging variances are normal. It's a chemical reaction inside of the battery, it's not going to be that consistent.
3. Make sure to charge from the exact same percentage level.
4. REPEAT THE TEST at least 3 times. If the test shows dramatic outliers, perform extra tests and make sure the test is consistent.
Does that sound like a lot of work? Yeah, but it's the only way you can actually make an assertion that one phone charger is faster than another.

Vincent Law said:
We don't need no stinkin' science in here!
A lot of people just assume their phone is charging faster because they're using a faster charger. Placebo at work.
Folks, if you want to properly determine whether a charger over 1.2 amps is worthwhile you need to do a proper test and remove all the variables:
1. Put the phone in airplane mode and shut down all apps and services. Best if you do this from a clean factory reset so the tests are on equal footing. Any apps using the phone will draw on the battery and influence the test negatively for that charger.
2. Up to 15 minute charging variances are normal. It's a chemical reaction inside of the battery, it's not going to be that consistent.
3. Make sure to charge from the exact same percentage level.
4. REPEAT THE TEST at least 3 times. If the test shows dramatic outliers, perform extra tests and make sure the test is consistent.
Does that sound like a lot of work? Yeah, but it's the only way you can actually make an assertion that one phone charger is faster than another.
Click to expand...
Click to collapse
No. This is exactly what I'm talking about. I charge my phone all the time. And the second I used this charger and consistently from then on the phones charges about 1/3 faster. I really don't care what is "supposed" to happen. It just works. I get my charger back on Friday and I will prove it. The battery usage shows a giant spike. Upwards compared to the more gradual spike with the stock charger. My Google edition HTC one used to barely charge while playing games with the stock charger and now it charges as fast as stock when I wasn't even using it.

rican408 said:
No. This is exactly what I'm talking about. I charge my phone all the time. And the second I used this charger and consistently from then on the phones charges about 1/3 faster. I really don't care what is "supposed" to happen. It just works. I get my charger back on Friday and I will prove it. The battery usage shows a giant spike. Upwards compared to the more gradual spike with the stock charger. My Google edition HTC one used to barely charge while playing games with the stock charger and now it charges as fast as stock when I wasn't even using it.
Click to expand...
Click to collapse
The HTC One's stock charger was only 1 amp, not 1.2 amps. It was clearly capable of charging faster, this phone not so much.

Vincent Law said:
The HTC One's stock charger was only 1 amp, not 1.2 amps. It was clearly capable of charging faster, this phone not so much.
Click to expand...
Click to collapse
I was actually using the 1.2a charger from my nexus 4 as the "stock" charger. For the same reason, I know more is better.

lg g2 charger works really well for me

High Capacity Charger

Just got my hands on the CyberMonday Moto X and I AM PSYCHED!
Now quick question.
I have a Blackberry Playbook Rapid Charger, that outputs about 1.8 amps. The voltages is identical to the A/C adapter from Moto. Can I use it to charge up the Moto X? Or would the higher current damage the internal parts?
My knowledge of electrics is limited to high school science, and subject to chronicle decay over the past 10 years.

DrDecoy said:
Just got my hands on the CyberMonday Moto X and I AM PSYCHED!
Now quick question.
I have a Blackberry Playbook Rapid Charger, that outputs about 1.8 amps. The voltages is identical to the A/C adapter from Moto. Can I use it to charge up the Moto X?
Click to expand...
Click to collapse
Yes
DrDecoy said:
Or would the higher current damage the internal parts?
My knowledge of electrics is limited to high school science, and subject to chronicle decay over the past 10 years.
Click to expand...
Click to collapse
No, the phone will only draw as much as it can support. Rapid charging is generally considered to shorten the life of lithium batteries however.

Phone will only charge around 1amp as far as I can tell. One of the things I miss about my s4 is that it charges at 2amps
Sent from my XT1060 using Tapatalk

The Moto X can pull at up to 1.5A
http://www.anandtech.com/show/7235/moto-x-review/6

King Speedy said:
The Moto X can pull at up to 1.5A
http://www.anandtech.com/show/7235/moto-x-review/6
Click to expand...
Click to collapse
Spec wise it may say that , but I haven't seen it hit anything over 940mah. Says full charge is 2.5 hours which sounds about right but that's a far cry from the s4 that charges zero to full in 1 hour
Sent from my XT1060 using Tapatalk

Legacystar said:
Spec wise it may say that , but I haven't seen it hit anything over 940mah. Says full charge is 2.5 hours which sounds about right but that's a far cry from the s4 that charges zero to full in 1 hour
Sent from my XT1060 using Tapatalk
Click to expand...
Click to collapse
Yeah I charge my S4 @ 1.9A and it's done in no time. I know it's bad for the battery but, that's the real benefit of having a replaceable battery!

Legacystar said:
Spec wise it may say that , but I haven't seen it hit anything over 940mah. Says full charge is 2.5 hours which sounds about right but that's a far cry from the s4 that charges zero to full in 1 hour
Sent from my XT1060 using Tapatalk
Click to expand...
Click to collapse
What are you using to determine that?

KidJoe said:
What are you using to determine that?
Click to expand...
Click to collapse
https://play.google.com/store/apps/details?id=ccc71.bmw
Sent from my XT1060 using Tapatalk

Legacystar said:
https://play.google.com/store/apps/details?id=ccc71.bmw
Sent from my XT1060 using Tapatalk
Click to expand...
Click to collapse
Thanks, I use that too. But I question its accuracy on the X since it doesn't properly detect my battery's capacity (i have to manually enter it), and often it shows -600mA when running (and not connected to power) even though I can get 24hrs+ out of the charge.
During charge cycles, I've even seen it only show +2mA and +3mA when plugged into AC (and battery is in the 40% remaining).
Right now when I look at it now, its showing +950mA while plugged into the Smart port on my Anker 2nd Gen Astro 3 12000mah battery.
Edit: now its showing +731mA so its all over the place. Not sure if this is the app or the phone.

Does anyone know how well these rapid chargers work with extended batteries like the Morphie or the Zero Lemon?

Greg8 said:
Does anyone know how well these rapid chargers work with extended batteries like the Morphie or the Zero Lemon?
Click to expand...
Click to collapse
As long as the charger's output voltage matches the device's input voltage requirement, any charger should work. Then it becomes how much current (amps, or A) does the charger output vs how much current does the device need to charge, which will factor into the time it takes to charge the device.
A few examples:
With a Droid Bionic that ships with a 850mA charger, it will barely charge when using a 550mA (.55A) charger or USB port on my PC. With a 750mA (.75A) charger it takes about 10 to 15 minutes longer than when using the 850. Using a 1000mA (or 1A) charger from my HTC Thunderbolt it charges about 20 minutes quicker than when using the stock 850 charger. Even though using a 2000mA (2A) charger can provide more current, the Bionic charges in the same amount of time as with a 1A charger.
iPad 3. It comes with a 2100mA (2.1A) charger. The 1A charger that comes with my iPhone 5 and 5s doesn't provide enough current for the iPad. It wont charge the iPad unless I power it off, and even then it takes way too long.
The X comes with the 1150mA (1.15A) "duo rapid charger." The X doesn't charge any faster using the 2.1A ipad charger (using a standard micro usb cable of course). And it does seem to charge at about the same speed as when using my 1A charger from my HTC Thunderbolt. While I've used the 850mA charger initially (so I didn't have to replace any of my cords on my dresser), I haven't timed its charging with the 850mA vs 1A.
---------- Post added at 11:53 AM ---------- Previous post was at 11:47 AM ----------
King Speedy said:
The Moto X can pull at up to 1.5A
http://www.anandtech.com/show/7235/moto-x-review/6
Click to expand...
Click to collapse
(sorry about replying to an old post but...)
it says "if you use that kind of charger" the article also says that the X comes with a 850mA charger yet mine is labeled 1150mA output. Either way, an 850mA or 1150mA can't supply 1500mA (1.5A) current.

[Q] htc charger... quick help please

need a quick help here. i accidentally left my charger at work overnight, and someone decided that its his/her's now ....ive searched around and cant find place to buy the original charger that came with the m8. HTC's website doesnt have it. amazon doesnt. even ebay dont carry it.
i need of a charger. currently using a LG G2 charger thats rated 1.8a 5v .....but with a super slow cable.
is the LG charger okay to use? will it damage my m8 in the long run?
i am also buying this cable on amazon. buy or dont buy?
http://www.amazon.com/Samsung-Universal-5-Feet-Charging-Smartphones/dp/B009OP8KCM/ref=sr_1_1?rps=1&ie=UTF8&qid=1401167720&sr=8-1&keywords=quick+charge+micro+usb+cable
yes, i know there is a quickcharge 2.0 coming out. seeing as the cable is only $5 ...im thinking it will do for now.
thanks in advance

HTC charger outputs 5V and 1.5A. As long as output voltage is same, you can use different chargers. Ampere value just affects charging time. Higher ampere means faster charge. In long term, it can shorten your battery's life, but I don't think 0.3A can cause an observable affect

D0GuKaN said:
HTC charger outputs 5V and 1.5A. As long as output voltage is same, you can use different chargers. Ampere value just affects charging time. Higher ampere means faster charge. In long term, it can shorten your battery's life, but I don't think 0.3A can cause an observable affect
Click to expand...
Click to collapse
thanks. ordering now

simpl3lang said:
thanks. ordering now
Click to expand...
Click to collapse
I use all sorts of chargers. They are pretty much standard now as far as micro usb goes. As said some are higher rated some are lower. I don't think there is any that will damage the phone as long as its designed for charging and is 5v.

I too use multiple chargers and cables and the only issue I've had is a double length cable that works for charging but won't allow connections to the pc
XDA app on m8 running venom

I charger capable of delivering more current will not damage your phone since the phone won't draw more current than it wants.