the spektrum recievers are a little slower and yes you have to run them in the beta mode but they are solid and work fine.

as far as the 2s lipo DONT do that without a voltage regulator .. the radios are only meant to run on 4.8 nominal volts.. with a peak of close to six. if you use more than six volts you risk damage to the radio and you void warrenty..

also there is a internal battery that keep the memory running so you dont loose your settings, while the battery is unplugged BUT if you leave the pack plugged in the memory will run off of the main pack instead of the internal battery.. thats why it drains the pack.