My Kadet that I learned on had a NiCad 700 mAh battery , and it worked fine. As long as I monitored its health, it was good. That's why I like the VoltWatch. Seems like most of us are agreeing on one thing. Checking and monitoring is important no matter what battery you are going to use. I eventually bought a Hobbico Field Quick charger, great when I go for that 5th, 6th "Last Flight" of the day.