Ive never drawn any schematics but to let you better understand my question i added simple schematic, down below. So my goal is to charge 2x 3.7V li ion batteries using 1x 5V source. So i can then power the fan which can take a maximum voltage of 12V (i know it wont always be on since the input volt…

How can i charge 2 3.7v li-ion batteries using 1 power source.

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