Installing 28000mAh batt:System ignores actual voltage, when estimating charge level.
I attached additional 20000mAh (28000 total) battery directly to the battery of my device (SM-P601).
But it's useless because system shows same speed of battery decline, as if it is on the original battery.
Process is the same even if you connect internal battery to constant voltage source, thus preventing any discharge at all.
When misestimated charge value reaches 0, system goes to sleep mode.
I've already tried the BatteryCalibration app from the market.
I'm on rooted stock rom 4.4.2
Could you please give me an advice to fix battery the charge estimation algorithm or prevent sleep at least.