Originally Posted by xxerexx
powerex/maha make some of the best nimh batteries and chargers. Just make sure your board can handle the voltage they output. Some of the 9.6v nimhs output 12v for awhile after finishing a charge. There aren't a lot of li-on/li-po batteries in a 9v (8.4v actual) form and are usually a bit larger so they're harder to fit.
Thanks for the help, any idea how to find out the max voltage for my boards?