[Gimmuniverse]

Hello,
My phone is Gionee Elife E7.

When I use 2A charger to charge it, it charges very fast but drain faster too.

But when I use 500mA it lasts longer..

What can be the problem??

[Rukbat]

You're not fully charging it when you use the 2A charger. Charge it to 100%, then an additional 30 minutes. (What you're seeing isn't a measurement of the state of charge of the battery, you're seeing the voltage on the battery's terminals. With the charger connected, that voltage is higher, so "100%" is probably closer to 90% with the fast charger. [We have no way, short of disassembling the battery, of measuring the actual state of charge - and you don't want to do that outside a lab, unless you're going to throw the battery away.])