Dual 18650 battery case for bike
thingiverse
Case for 2x 18650 batteries, incl. holder for a 2,5 cm wide velcro strap. At the top you have about 2 cm space for a mini step-up and mini usb charging board. Batteries can be wired in parallel for more power at 4.2v or in series for 8.4v, depending on your needs. I use the case on my bike to supply an led lamp.
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