Prints in two pieces.
The lower piece can be held in with a zip tie, and has room to use the original velcro strap to connect the battery. Designed for a 75mmx34mm battery (2200mAh 2S), but can hold up to 88mm and maybe more with some modifications.
M2 or M2.3 flathead screws connect the upper tray to the lower piece.
The author marked this model as their own original creation.