Vasek,

I use unregulated 5 cell nicad packs in all of my planes. I use mostly JR servos and a few Hitecs. There's never been a problem with any of the JR's. The only servo that hasn't held up well is the Hitec HS225. I'm sure that there are a few other servos out there that don't like higher voltage, but I haven't run into them. Best bet is to follow the manufacturers recommendations.

The only anomaly is that occasionally the servos will jitter when first turned on just after fully charging the battery. In that case all I have to do is wiggle the transmitter sticks a few times. That causes the battery voltage to drop a couple tenths of a volt, the jitter stops, then go fly.

Joe