Ah my bad. I see that question constantly so it was a natural reaction to answer it that way. LOL I'll edit it

I use GP2100's AA's and they have great capacity. The voltage isn't as high as energizers but they stay around 10.1 volts for a long time.

To use the charger that came with the 3PK, you'll need to buy the Futaba nicd 8 cell transmitter pack.

John