Internal battery swelling

[ItHurtz]

I almost confirm is hardware issues solder the internal battery again.... use it only internal battery without external... from 85% until now 30% more than 5 hours no restart at all... Will test it over the week end with external battery

The new internal battery is 3.7v 3000mah. My ROM 3.2 using 2 SIM with micro SD card.

I mean it's probably not battery problem as you suspected. And you just proved it because battery working fine past %.
So it's either software or hardware (PCB board etc...).

When there are 2 batteries, there are more software calculations involved. Because it needs to decide which battery to draw power from, so can still be some calibration issue etc. Finding our what is wrong is process of elimination. If you do factory reset, and still have the problem, okay you know is not current ROM data problem. If you flash QFIL ROM and still have problem, okay you know it's not internal config problem... Etc..