How long.

My question is, because i thought it would be a LOT longer than it looks like...

My cousin was over with hi kid last night...and the little one turned on the reciver switch...so this morning during my pre-departure to the feild check....i see my battery is down at 1 volt....ok, a little miffed, but oh well...

An hour later i check it to look at where we're at..and im back at 5 volts....is that a true reading or does that not sound right...i was under the impression that it took longer to recharge these things...