Just another 18650 to 2x D-Cell Adapter
thingiverse
Just another 18650 to 2x D-Cell adapter. Simple and easy printable without support. Designed for a 8mm metal rod insert with ~53mm - 54mm length. If you have no solid rod by hand, you can also roll some alu foil for temporary use. If you need a bigger surface for the negativ pole (for some flashlights), there is a slot for a 5 Eurocent coin at the bottom. I use this adapter in a D-Cell powered fuel transfer pump and my flashlight Be carefull! 18650 can be very powerfull. You will also get up to 1/3 more battery voltage from the Li-ion than with the original 2xD-Cell. Use this adapter only if you are familiar in handling of Li-ion batterys.
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