I'd say no...because most servos can run on a 6.0V power source...when fully charged would be 6.8 to 7.2 V......
If you have a glitching servo look at how close to the transmitter the receiver is if you're close.... back the transmitter away a few feet.....or if you have an extension remove or replace it.
If you're glitching servo is on a dual servo set up using a Y make sure both servo are the same......lastly look at your on/off switch