I have an GS3 Sprint SPH-L710 using liquid smooth ROM, my battery life don't really last me all day, but whenever my phone is getting to 19-14% it goes completely dead, have anybody had/has the same problem and know a solution for it?
Yep. Use a Touchwiz ROM. Or if your attached to the ROM try using a battery calibrator.
My ROM: WICKED X
I thought battery calibrating was a myth haha 
.
I had this problem before as well and switching OS's between TW and AOSP didn't help.
If your screen is flickering at around 15% and then your device cuts out, it also indicates the battery is gone for good.
I'd suggest getting a new OEM battery or go for a third party company like Gorilla Gadgets or iAnker Tech.
But flashing a TW ROM is other worth your shot as well if it'll fix it
.I had this problem before as well and switching OS's between TW and AOSP didn't help.
If your screen is flickering at around 15% and then your device cuts out, it also indicates the battery is gone for good.
I'd suggest getting a new OEM battery or go for a third party company like Gorilla Gadgets or iAnker Tech.
But flashing a TW ROM is other worth your shot as well if it'll fix it
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