I've had some serious issues with the Spektrum receiver batteries. I bought several brand new ones at an IMAA fly-in and several more off of eBay based on my initial good impressions of them. My positive opinion didn't last long. Just over half of them were bad. some would only hold 300mAh or so when cycled and others were shorted and would do nothing. I threw the rest out and pulled out the ones I had installed into airplanes. Several other club members have talked about similar problems.

I love my DX-7 radio but their Ni-cad receiver batteries scare me.