Galaxy S3 I9300 - Slow and inefficent charging problem.

[Yoink676]

I use nexus 9 cable with Samsung 2.1 ampere charger.
Also I turned the current to 2100ma using arter kernel..

It charges 0 to 100 in just 50minutes now
(2100Mah battery)
[Hide]Theoretically a 2100Mah battery is supposed to charge fully in 1 hour when charges with 2100mA current , but here there is also a increase in voltage (4.3V which is more than the stock 3.8V)
So
Power=VxI
(2100mah×3.8v)÷(2100ma×4.3V)=0.88h=52.8 minutes
Which actually matches the real value [/hide]
BTW battery can go insanely hot which may damage it so I use a external cooler to keep it down and I can't use it while it is charging.

 

[ChilePowered]

I purchased a Samsung Galaxy S 3 in Nov. 2014. Lately the charger that came with it is charging slower and slower, to the point that if using it while charging it still loses ground, so to speak, in that the % charged goes down not up. Have to either put the phone to sleep or turn off for it to make positive progress in charging. From other posts on this forum, decided to try testing the cable from the charger. I also have a couple of portable battery packs that can be charged and taken to charge the phone when in transit. Took a cable from one of the battery packs and used it and the plug from the supplied cable to see if it would charge faster. Yes, it did. Much faster. For my case, that indicates the cable from the original charger is bad, not the pin(s) on the phone base connector. If I get a new charger & cable, I will report back but for now may just use the cables from the portable battery packs. These battery packs are cylindrical, about 3" long and 3/4" in diameter. They have for some time now charged the phone much faster than the original USB wall charger.

 

[Michael Newby]

this is the exact same issue im having