Hi all I have a EF Sabre (don't laugh) , I bought a lipo 2 cell 7.4 volt 1320mA pack for it. I am trying to figure out the best way to determine when the pack has been drain sufficently enough to recharge without bringing it down past 6.6. I have flown the helo for quite a bit and the battery still read 7.4volt. But the helo cannot fly very high maybe a foot or so. Should I just recharge it now or keep hovering till it gets down to 6.6 or will no longer hover. The Sabre stock battery is 8.4 volt NimH 630 mAh. Any thoughts would be appreciated.

P.S. HB CP2 en route