How to calibrate a new Nexus 5 battery that's higher capacity than original? Just got a KBTEL battery that's 3800 mAh compared to the original 2300 mAh nexus battery. I charged it dead overnight, and now its been running for more than 7 hours and the capacity shows below 5% for an hour now but its not dying. How do i get the battery meter to show the actual range? The system still detects a 2300 mAh battery.
Battery Calibration thread on XDA forums. Download from the Play Store.

Description°
Requirements: Android 2.1+ | Root permissions
Calibration needs to be done after flashing a new ROM, but you can calibrate any time you think your battery is miscalibrated. This program does it by removing the batterystats.bin system file. The OS generates a new clean batterystats file soon, thus any fake information from the previous ROM is removed.
It's suggested, but not necessary, to let the phone fully discharge after calibration, then charged to 100% without break.
The app shows your actual battery status, and only allows you to start the calibration (i.e. removes the file) when it's fully charged, unless you force earlier calibration.

°copied from https://play.google.com/store/apps/details?id=com.nema.batterycalibration