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batteries - How to charge two 18650s in series without a middle connection? - Electrical Engineering Stack Exchange
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YMYH 18650 Battery Charger 4 Slots, USB Rechargeable Battery Charge for 3.7V Li-ion TR IMR 10440 14500 16650 18650 16340(RCR123) Batteries With LED Display (No Battery): Amazon.co.uk: Electronics & Photo
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battery charging - Smartest way to charge 18650 batteries when they are used in series - Electrical Engineering Stack Exchange
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