Power bank 18650
thingiverse
The human layer is 0.2 millimeters thick, filled to 30%. The 18650 battery is inserted into a spring-loaded box that holds the 18650 cells. 5V step-up power modules and lithium battery charging protection boards are available online at aliexpress.com. A single module costs $3.27 and includes a boost converter and LED display. 18650 battery clip holders are also available in packs of five, complete with wire leads and a black plastic case. The price is $2.25 per pack.
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