I replaced my battery also. The biggest problem was charging the new hi cap battery. The stock charger, charges at 70 ma to the transmitter and 100 ma to the receiver. That roughly translates to a 700 and 1000 mah battery, You need a charger capable of 200ma to get a battery to full charge in a reasonable time. My first replacement was a 2000 mah Ni-HD battery. I blew out a cell trying to charge it on the accucycle. I cycled it and then after the charger went to standby, I pulled the battery and turned off the charger to reset it. Pluged things back together and hit it again. I'm guessing the charger doesn't detect full charge, and just charges for something like 15 hours. Anyway, it fried my new battery. I ended up with a good four cell for a receiver out of it though.

Don