Update:
It only seems to happen when phone stays plugged for some time (4h) after end 
of charge.
 Then it stays for a while at 100%, and drops suddenly from 10%.
Problem disappears if phone is unplugged within 2h after full charge.
So maybe a calibration problem, but possibly without solution due to changing 
battery parameters (voltage for energy, etc...).

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Touch seeded packages, which is subscribed to upower in Ubuntu.
https://bugs.launchpad.net/bugs/1562636

Title:
  battery percentage drops suddenly from 10% to 1%

Status in upower package in Ubuntu:
  New

Bug description:
  The battery percentage drops from 10% to 1% and probably less in about a 
minute, even with phone locked and inactive.
  This has happened twice in a row already, and probably will systematically.
  Battery warning means I need to plug in instantly to avoid shutdown.
  There seems to be no way to calibrate battery measurements, or set a 
different warning level.
  I have no idea where to get log history for battery level, but I'll do it if 
someone gives me directions.
  Thanks,
  TM

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: upower 0.99.2-2
  Uname: Linux 3.4.67 armv7l
  ApportVersion: 2.17.2-0ubuntu1.3touch1
  Architecture: armhf
  CurrentDesktop: Unity
  Date: Mon Mar 28 01:20:15 2016
  InstallationDate: Installed on 2016-02-17 (39 days ago)
  InstallationMedia: Ubuntu 15.04 - armhf (20160217-111536)
  SourcePackage: upower
  UpgradeStatus: No upgrade log present (probably fresh install)

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