hi all!
i am facing problem of one cell over discharging on board my quadcopter.i read on line and was intimidated by the ill effects of over discharged batteries.then i read some where that kk2.1 has a low voltage alarm set up port.but strangely i have not been able to find out how to wire the connections.can please anyone help me.
thanx.

ps: i am using a x525 quad with 3300mAh 3 cell 25 c battery with a iMax B6AC charger.

Don't know whether there is battery monitor on board KK2.1, But you can get a LiPo low voltage alarm  For cheap.

Yup,
There is a LiPo voltage monitor on board KK2, See this RCG thread,

http://www.rcgroups.com/forums/showthread.php?t=1687039