I want to plug a 12v DC charger into a jack on my device to charge (2) 18650 batteries in series (7.4v). Will this safely charge the batteries 'as is' or will I need a voltage dividing circuit to lower the Vs down from 12v. If I do need a voltage divider circuit, what voltage should I be bringing the 12v (Vs) down to?
Thanks for any help and guidance.
Thanks for any help and guidance.