Yub;
If it doesn't buzz at 4/10 in. your good to go. Bat. will be OK. What I meant about the bat. is the more load you put on it the more the servo drain. The harder you push on the servo arm the more amps is drawn from the batt. When you get some xtra change, a good tool to get is an Expanded Scale Voltmeter. When your out flying , it will tell you how much power you still have left and when to recharge.