ORIGINAL: OhD
I've been using a redundant battery setup that taps off the bottom two cells of the balance connector on the motor battery pack. I also have a onboard meter from Dreamworks that will read two voltages. This allows me to check both the rec/servo pack and the motor pack before each flight to assure both are charged.
Jim O
I'm running a 2S LiFePO4 pack for RX power.
My TX display shows me:
RX battery Voltage
External (Battery) Motor Voltage
Altitude
A quick glance and I have all the info I need.