Alright, so a got a CP2 a few days ago, and with it came a 11.1V 1300mAh Li-po battery and a Li-ion charger. The heli ran great at first, I was getting around 15 minutes of flying time. I would run the heli until it could only fly in ground effect, and then charge it. The charger output is 1 A, 1000 mA, which would mean it would take 1.3 hours to get fully charged. But, assuming it had at least 9v left (although I had no means of making sure), I only would charge it for about 30 minutes. Well on about the 6 or 7 battery I notice that the life is severely declining. I can only fly for a minute or so, and now not at all. I even put it on my friends peak charger, but it still wouldnt fly much more than a few seconds.

My assumption is that I somehow screwed up the battery... Any suggestions?

It sounds like you have over-discharged the battery and ruined it. Lipo batteries are very sensitive to being overly discharged, and can go bad after just 1 time of this happening.

If you are flying until the heli can no longer hover out of ground effect, then you are almost certainly running the battery too low.

I ruined several batteries this same way when first starting out...

Thanks for confirming my suspicions. I guess tommorow I get to go buy a new battery and a voltmeter

Also, refering back to my origional post. I bought this heli new, and recieved a Li-ion charger and a li-po battery. Ive heard that Li-ion can, and also ive heard they cant, charge lipo batteries. Any insight into this?