This Is a basic battery holder I modeled to fit the common 18650 battery. The metal battery clips I used can be order from "https://www.digikey.com/en/products/detail/keystone-electronics/5205/2745874". The clips are necessary for the battery to stay. The clips need a little pressure to be fitted right. The clips can be removed with a flat head screw driver and a little patience.

Creality

Ender 3 Pro

No

Doesn't Matter

High

100%

In my findings supports are optional, just lay the model flat on the build plate.