Power bank
thingiverse
A Portable Power Bank that Revitalizes Cell Phone Batteries. Specifically, two Note 3 batteries totaling a massive 6400mAh. Link Electronics https://www.banggood.com/it/Dual-USB-5V-1A-2_1A-Mobile-Power-Bank-18650-Battery-Charger-PCB-Module-Board-p-1031593.html?rmmds=myorder&cur_warehouse=CN March 15, 2020 Update: Version E is added, with an internal expansion to 19mm, accommodating standard 18650 batteries for insertion.
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