Li‑ion 18650 dual charger case
thingiverse
I built a universal charger for all 18560 batteries. I used one controller per battery: https://www.ebay.com/itm/5x-5V-Mini-USB-1A-Lithium-Li-ion-Battery-Charger-Module-TP4056-TE106-DIY-Arduino/152806059123?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20170511121231%26meid%3D2a620fbc1f1e48a99c7a0962a1f0aff1%26pid%3D100675%26rk%3D2%26rkt%3D15%26sd%3D262794896848%26itm%3D152806059123&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A7bf1d4fa-b82f-11e8-bb0f-74dbd1807c88%7Cparentrq%3Ad89cae911650ad7897f5d1cbfff8f11b%7Ciid%3A1
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