For what its worth, I've got a stack of fried batteries from over agressive charging. I always though that you could charge up to rate after the battery was cycled on a slow charger two or three times. The last Nimh packs I bought, had a warning on the lable Do no charge over 1000mah rate, and these packs are 2300mah packs. I about lost my first plane when I put a NImh in the transmitter and left it on the charger for a couple days. Out to the flight line and I was showing 11.2V. Two minutes into the flight the battery alarm went off, it had dropped to 8.8v. I had fried two cells by overcharging. I've got a set of 8 individual nicd AA cells for my camera, and I killed them fast charging also.

Slow and easy is the way to go. If you use one of the high capacity packs, it should last all day unless you are a dawn to dusk flyer.

Don