Moblite7 battery holder

I re-remixed the following to add a thin section to the bottom opening as I printed in TPU. I also moved the clasp notches closer to grab better and extended it a bit length-wise so the slides and holder do not flex as much with TPU. Works great!

Remixed from: https://www.printables.com/en/model/356135-battery-holder-for-happymodel-mobula-7