Heltec wireless tracker case with 18650 battery and on off switch

Remiz from the original one here:
https://www.thingiverse.com/thing:6623869
(thanks to @BotMeka)

Inside of the box is a little larger. So slightly larger 18650 battery holders can be placed.
And there is a hole on the top for a IC125B S Mini type switch.

Required: IC125B S Mini switch.