18650 to C size battery (almost)
thingiverse
I converted an old flashlight to LED, swapping out three C-size batteries for two 18650 cells wired in parallel. Since the 18650 cells don't match the size of C-size batteries, I created this adapter. The height of two adapters is slightly shorter than that of three C-size batteries, but they work great because the LED light fills the missing space. The adapters feature holes and slots for wiring, allowing them to be used in series or parallel as needed. I bonded them with super glue, and now my flashlight operates flawlessly, lasting indefinitely. Just be mindful not to over-discharge the 18650 cells. This design can also be applied to other projects.
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