Any charger is better than the Walkers one. One thing about your radio is that the throttle and the pitch channels should be mixed together. Your channel mapping is different than what we consider normal here so don't know if I can help with that. Here in the states channel one is aleiron, two is elevator, three is throttle, four is rudder, five is gear or aux ( often used to control the gyro gain ), and six is the collective pitch. If your mode of radio is different then the mapping is probably different also.

Hope that helps,
Huey

PS Giz is correct about the red button. It is an arm ( satety ) swicth for the esc.