You want to charge at 1C or less. 850 mah would be a max of .85 amp charge rate and the 1200 can handle 1.2 amps.

Duane--you need to adjust the proportional, not the gyro. You have to disconnect the battery each time to make the adjustment. IIRC turn counterclockwise to make the nose go left. Adjust in very small increments. Just to clarify- you are talking about the tail out of control, right? Because that's the only thing the propo or gyro control. If you're talking about the whole heli leaning to the right, your swash is out of level. That also could account for backward flight. It is normal to have to give a little right (not left) and forward stick while lifting off. First try adjusting it out with the trims. Keep in mind you will always be making slight corrections for side to side or forward/backward movement while in flight.