ORIGINAL: jetmech05

There are a couple of things that could have happened....
You could have a bad battery
you could have a bad switch in the airplane that either didn't let the battery charge or once charged let the battery drain...(shorted on)
You could have a bad charger....

Please don't buy a voltmeter that doesn't put a load on your batteries...all it will tell you is the voltage of the battery at that time...and will not give you any idea of the true state of the charge.....

But a non loaded voltmeter can tell you if you have a bad switch or charger.

I'd double check everything...make sure your battery is hooked up to the switch correctly....make sure the switch is off....make sure that you charge overnight 15 to 17 hrs, not the night before but overnight....make sure the leads are hooked up correctly...and with the transmitter on charge as well make sure you have 2 red lights