[SOLVED]A SIRIOUS problem with low battery warning

Hello,
I bought and recived my gamebuino about 2 months ago, It all worked fine.
Unfortunatly I ran into a sirious problem. Yesterday I left the gamebuino to charge up. Today at 8:56 I powered on the gamebuino but after 5 MINUTES OF PLAYING the gamebuino displayed "Low battery PLEASE TURN OFF" but the battery voltage was 4175mV and in the settings gamebuino should say something like this at battery voltage of 3550mV!
Also when i unpluged the gamebuino the "Full battery" LED was turned on! Also half a second before this warning gamebuino displayed full battery!
What is going on? I only have charged and discharged the gamebuino 3 times!
Can anyone help me?
I bought and recived my gamebuino about 2 months ago, It all worked fine.
Unfortunatly I ran into a sirious problem. Yesterday I left the gamebuino to charge up. Today at 8:56 I powered on the gamebuino but after 5 MINUTES OF PLAYING the gamebuino displayed "Low battery PLEASE TURN OFF" but the battery voltage was 4175mV and in the settings gamebuino should say something like this at battery voltage of 3550mV!

Also when i unpluged the gamebuino the "Full battery" LED was turned on! Also half a second before this warning gamebuino displayed full battery!
What is going on? I only have charged and discharged the gamebuino 3 times!
Can anyone help me?