Another thing that kiils batteries is sitting around unused for long periods of time,, I took about 5 years off from flying, was racing r/c cars/trucks, all my aircraft NiCd batteries were junk from sitting,,, sounds like abaser may have gotten a hand me down that sat around a while too. These things charge up, but they peak early and fall off fast,, even after cycling the packs a few times, they just didn't have the capacity,,, they all went into the Haz-mat recycle can.

abaser, and any one else reading
A good charger that cycles and discharges with a digital readout is a wise investment, test those packs on the bench,, not in the air
Best $100 I ever spent on this hobby.

good luck