20000mah power bank
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Description
A 20000mah power bank with a built-in output cable, designed for ultimate compactness.
Utilizing four 5000mah 21700 lithium-ion batteries connected in parallel for a total capacity of 20000mah.
Print the casing vertically and the panel horizontally.
Requires the power bank kit motherboard shown in the image; remove the USB-A female connector and trim a data cable for direct soldering.
Requires four 21700 lithium-ion batteries, installed in parallel.
Requires several relatively thick conductive wires; I used 20 AWG.
Requires a spot welder, soldering iron, and several nickel strips.
Secure the cover with hot glue or super glue.
The motherboard supports 22.5W.
Due to limited equipment, testing shows that 18W input/output is reliable.
Battery cost: 35, motherboard cost: 31; other materials' costs were not recorded; total cost: 66 yuan.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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