Dual 18650 battery power pack case
thingiverse
Case for 2 18650 batteries, including holders for the flat and spring connectors, and routing for wire to form a battery pack. Batteries can be wired in parallel for more power at 4.2v or in series for 8.4v, depending on your needs. Clips on sides ensure the cap goes on only one way, and I've found the layer lines make an excellent fastening to hold the cap in place nice and snug. I'm using this as a spare battery pack for the main light on my MTB for night rides. Twice the capacity of the original, and I can swap in as many batteries as I like.
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