18650 Portable Charger

A pelican style case that functions as a portable charger, 18650 powered!
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updated June 8, 2023

Description

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This waterproof 18650 powered portable charging case is simple and cheap to put together! Even with cheap 18650 cells, the 5 parallel set up can allow for 10,000mAh, better cells will give you even better power storage! 

 

Parts needed: 

TP4056 circuit (1) 

MT3608 DC-DC converter (1) 

Female USB port (1) 

Rocker style switch (1) 

18650 cells (5) 

M3x40 screw (6) 

M3 nylock nuts (6) 

Super glue

 

The 18650 cells should be wired in parallel (positive to positive) in a stack of 5 to properly fit inside the case. To make the case waterproof, use a strand of Ninja flex, or similar flexible 1.75 filament. Simply cut a piece of filament, press it into the groove around the case, and ensure it wraps around the entirety of the case before cutting off the excess. 

Use M3x40 screws and nuts (nylon lock nuts are recommended) to hold the case together. 

Attach your modules and wires to the “control panel” prior to fitting it into place of the case. A few dabs of super glue will ensure the control panel does not move or become dislodged. 

Hot glue or similar thick adhesive is encouraged on the 18650 cell stack in order to keep it mounted in place as well. 

Be sure to follow the wiring diagram located in this post to guarantee a successful build! Remember to take precautions when working with 18650 batteries, wires, and cables. Eye protection is highly encouraged when working with small parts that could possibly damage your eyes. 

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