Hi all im about to buy a controller its a Futaba FP6EXH as this model got a timer built in so i can monitor the time left on the helicopters battery
No radios that I know of will monitor the battery in the helicopter, some radios do have a stop watch, but that's not going to tell you anything. I would suggest getting a battery checker to monitor your battery, their are all kinds of different ones on the market that will work fine.