T-Deck 18650 back for Alley Cat case

a modded back for Alley Cat T-Deck case. enable the user to use 18650 battery and quickly swap them. if using the double model they are wired in parrallel. i heat up the contact with a flame while holding with pliers and melt them into the slots. back is from Alley Cat https://www.printables.com/model/741124 18650 holder is from fairymoth https://www.thingiverse.com/thing:2289291