One of the problems with many Ready-to-fly electric airplanes by Hobbico and Hobbyzone is that the battery chargers bundled with the airplanes are junk. These chargers will often indicate that the battery is fully charged when, in fact, it's far from it.

Your best chance of testing this is to obtain a decent battery charger like a Hobbico Quick Field Charger MkII ($49.99 at Tower) and using it to top up your flight battery after your bundled charger says it's ready. If the Hobbico QFC says it's topped up, then you got one of the few included chargers that actually works. If it takes a while to top up the battery after the included charger says it's done, then you know the included charger was dung.

If you're going to fly electric airplanes, buying a decent battery charger is simply a smart investment. A decent battery charger starts at $30 to $50, and they aren't included with $59 to $129 electric planes.