Coast Flashlight 18650 adapter
thingiverse
Adapters to convert a Coast flashlight to a single 18650 cell. One is just a battery holder and is meant to be used with protected cells only. The other includes a spot for a battery holder and a tp4056 board (make sure to use the variant with undervoltage protection). The usb connector on the tp4056 needs to be removed or trimmed so it doesn't contact the metal inside the flashlight. The flashlight will be dimmer (6v to 3.7v) and won't last as long but now it's rechargable.
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