hey crash080 I use 2 2500 mah 6v NiMh for any of my planes .90 size and up with 2 switches... no regulator needed just run one battery and switch into the battery port on the reciever and one battery and switch into a spare aux channel port. http://cgi.ebay.com/3-RC-6V-2500mAh-...QQcmdZViewItem look there for cheap ones that work great! I have used batteries like this for over 3 years now from ebay and have never had a problem with any of them $24.95 for 3 battery packs 6 volts with 2500mah. Hope this helps.... This info helped me a few years ago and I still love these batteries.!

Enjoy
Jon