The stock battery mount on the Happymodel Mobula 8 likes to break after some not-so-soft landings and snaps where the two crossbars connect to the side of the battery holder. This model replaces the crossbars and hooks into the sides of the battery holder. To use it, you need to carefully cut away the remaining crossbars. Then hook the part in from underneath. One side at a time. Unlike shown in the photos, you don't need to remove the stack to mount it. Works with the same standard battery size than stock. If you need it to fit a different battery size, let me know or make a copy of the design and edit it yourself in OnShape.

• PLA or PETG
• Two or three outer layers
• Infill 15%
• The version with the cutout needs support. 

It's pure snap fit. Don't glue it in, if you ever want to be able to remove the motor connectors without unscrewing the stack.