Installing 28000mAh batt:System ignores actual voltage, when estimating charge level.
Check low and high voltages on your battery
You can do this with many software from Android play store
My high voltage (100%) is 4.315 and low was 3.6 or 3.4 (not quite sure because now I'm testing new battery)
It seems like operating system does not estimate charge level from the battery voltage
It is rather done from power consumed from the battery
High voltage is always 4.315 because of constant current / constant voltage charge algorithm
But if you start your new firmware from a low charge, operating system can underworlt and damage your battery
---------- Post added at 02:34 PM ---------- Previous post was at 02:08 PM ----------
Now it shows 43% with 4117mV on battery!!!