Most existing 2x18650 battery sleds need to be modified to fit inside Hammond 1590G enclosure leaving enough room for the other components.
This custom dual 18650 battery sled will fit in the 1590G without requiring modification (of the sled) and leaves plenty of room for the rest of the components.
Because one of the bottom screw posts needs to be removed regardless which dual battery sled you use, this sled has a built in magnet mount where the screw post was so you still have all 4 magnets holding the lid securely.
The magnet hole is designed for a 3mm (diameter) x 4mm (height) magnet and the channels for the battery contacts fit the Keystone 1017-1 battery contacts.
This sled is available with clear marking for either series or parallel batteries.
Gently clean up the hole for the magnet using a 1/8 drill bit, do this by hand.