I've noticed that when the AC power is plugged in, the battery applet in the system tray always reports "charging", even when the battery charge reaches the set threshold and the battery actually stops charging. The notebook is a Lenovo E520, and I set the battery charge threshold with tpacpi (or Lenovo Power Manager in Windows).
While the applet incorrectly shows "charging", the command line reports the correct situation:

    user@PC:~ > cat /proc/acpi/battery/BAT0/state
    present:                 yes
    capacity state:          ok
    charging state:          charged
    present rate:            0 mW
    remaining capacity:      17270 mWh
    present voltage:         10860 mV



Everything else works correctly. It reports "discharging" when the AC power is unplugged, and so on.

I've tried to charge the battery up to 100% and the applet correctly reports "not charging". The same happens if I set a very high thresolds (like 99 or 98).

So the problem only shows when I set a relatively low charge threshold (like 90%): the bios stops charging the battery at the set charge threshold, but the applet still says "charging". 

This is on KDE 4.14.2. 

Reproducible: Always

Steps to Reproduce:
1. Plug the AC cord.
2. Let the battery charge up to set threshold.
3. The battery stops charging at the set threshold.

Actual Results:  
The battery widget still says "charging" (even after reboot).

Expected Results:  
The battery widget should say "not charging".