I have a Futaba transmitter that I bought from a friend at work. It has a battery adapter in it with separate 1.2v nicad batteries in it. I don't think the batteries are holding a charge for very long anymore and I was wondering if it would be a bad idea to use NiMh batteries instead of nicad? NiMh are easy to get at Wal-Mart but I would likely have to order nicads to replace the ones I have now.