I have the hitec 7775MG and have tried the savöx 1251 both work really well and can recommend both.
Take note that if you just have the battery against the servo and not screw down the battery holder enough there is a risk that on a heavy nose dive the force can crack and break the servo lugs.
I have added some (what I had lying about) window/door jam/frame sealer that has double sided tape on one side and rubbery under my battery strap to help hold it in place.
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