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Not all 18650 batteries are the same with regard to their voltage. The only things that are common with 18650 batteries are the dimensions – 18mm x 65mm and the fact that they are lithium-ion. Most 18650 batteries have voltages ranging from 2.5V to 4.2V. Different 18650 batteries are built with different intentions in mind. It would be best if you’d consider checking your 18650 battery’s capacity and voltage before buying. Mismatching batteries can prove to be detrimental to your devices. 2 years, 8 months ago
