Hot-swappable 2x18650 battery T-Deck

The Chonk remix of Alley Cat T-Deck back cover to add 18650 battery hot-swapping. Sadly it got a bit Chonky. I used this battery insert with the original M3 heat inserts and screws to hold it. I used the same print settings as the original. For the inserts to stick I used some glue after using the guiding holes