I've been using the Mini-FuelGauges for several years now to monitor receiver batteries in my sailplane and they are THE BOMB! No more guessing about available capacity or flight duration... no more worrying if that retract servo jammed and is draining the battery... no more voltmeters at the field (and unloaded voltage check is not a reliable indicator anyway)... just set an alarm on your transmitter with conservative limits on capacity and voltage, and fly it. You will know EXACTLY when and if you are having a battery issue and need to land!! In addition these units have an FER feedback, otherwise totally unavailable with Futaba, that also lets you monitor signal reception. Finally, we have the battery telemetry we need.

Rating: [5 of 5 Stars!]