It's probably not a good idea to fly more than a couple of feet off the ground. The battery is subject to unexpected failure. Maybe just start the motors and watch the voltage for about a minute or so to see if voltage drops before even attempting a lift off. Right now, you're looking at a new battery. A crash will obviously add expense and nuisance. And you would still need the new battery.
If you see voltage dropping as soon as you lift off, land. GPS will drop out. But I guess you pretty much already know that.