House's a 2000mAh Makerfocus battery. Currently still a work in progress. There is no mount built into the case currently. I cut a hole with Prusa slicer for a command strip mount in my car. (printfile.3mf has this precut and can be modified for other strips.)

3 x M5 8MM screws on top
2 x M5 6MM screws for the lid of the heltec inside