I love my Spectrum radio system. I have it in 4 airplanes and have had almost no problems. The supplied battery for the DX 7 system's AR 7000 rcvr. is a 4.8volt NI CAD not a NiMh. I did have my first one not holding a charge after 1 year. I replaced that battery with a 4.8 valt 1600 mah NiMh battery. I did buy a good Triton charger and after deep cycling my original battery, it seems fine. I still use the 1600 mah Ni Mh for all my planes. I was told that the servo life ,(JR 821), would be compromised with 6 volts. Why do we need the 6 volt batteries? Just use higher MAH units at 4.8volts. I do have a "Winged Shadow Reporter" on every model. For 25 bucks you get a neat little device that will sound a loud signal if you lose your airplane. Mine is on the ldg. gear channel so I just flip the switch to hear the beeper. The secondary 2 advantages are that a double flip of the switch will cause the device to beep the voltage at the present time. The other neat feature is the every 30 second loud beeps if the voltage is below 4.6v. Even with the engine running you can easily hear that low voltage warning. With this little goody you should never have another rcvr. low voltage problem and should be able to identify a bad battery before you lose the model. And if you crash in the woods, you can find whatever is left of your little darling.[8D]

www.wingedshadow.com