I have a dx8 with telemetry on most of my planes and I have replaced all my nimh batteries after recording in flight voltage drops as low 4 volts with them. I use mainly dual turnigy life batteries with a min. of 30c discharge and have next to no in flight voltage drop now. I did also find a switch that was causing a voltage drop in a plane so I replaced the switch with 2 new switches with dual batteries! I'm sure countless radio manufactures have been trashed by rc pilots after crashes when the TRUE culprit of the crash was a weak or worn out reciever battery