MAGLITE - 4x D cell to 3x 21700 adapter (250mm tall)
thingiverse
adapter for maglite 4xD cell flash light to 3x 21700. loading tube is 250mm with room for cap as well as bolt head or spring at the bottom. full isolation between metal chassis and battery Adapter has an 8mm hole at the bottom for a 8mmX10mm tall spring (the bottom inside plate is 5mm thick). 33mmOD, 22mm ID, 250mm in height. spring attached to back of cap. electrical tape used to have a semi-tight fit for adapter to not easily slide out when changing batteries. batteries used were salvaged tesla 21700 batteries.
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