Klinik R/C Cougar KC Laydown Battery Cradle Holder #KRC-SCHCRADLE

You swap batteries on every race. It takes time and the location is weird (next to the motor wires).

I noticed some fellows had this klinik battery holder with the rubber band.

Fusion 360, a few hours, 4 versions down the line and here you are!

print and enjoy!

2 rubber bands needed or even better, hair bands from the wife (as per photo)
2 longer screws and 2 nuts and 2 washers.

you can flip it (front to back) for extreme battery positions.

tried the PLA version. racing indoor