is this overcharging battery? I used ESKY 11.1v battery charger for 11.1 1800maH 20 c lipo "mystery" battery. Usually with Esky battery it took around 2 to 3 hours to charge fully and mystery battery's been charged for over 7 hours and it runs for well over 20 minutes? I'm a little bit afraid of what's going to happen if I overcharge it and I read some threads saying "never charge the lipos for over 2 hours". I also bought a charger with balancer and repair function and its on its way to me. Shall I keep using esky charger for normal use or should I just wait and don't bother till the other charger arrives?

BTW I am getting a HBK 2 and am willing to know which parts to upgrade [other than Motor and ESC since I'm already aware of it.] for the better performance and more safety.