TEAM ASSOCIATED BATTERY KNOBS

Here are some replacement battery thumb knobs for Team Associated (or perhaps other ) RC that use a battery strap like the one in the picture.

For best results print at full infill, use a brim skirt and support structures. You may have to reopen the hole after printing, just in case the brim skirt has sealed it.
I also recommend to pre-thread the first portion of the bore, so you don't have a misaligned angle.