My ecig / vape takes two 18650 batteries in series and has two indicators for the battery charge status. They often differ, and if I swap the batteries around the indicators swap charge levels.
My high school physics memory says two batteries in series are cumulative, so how does the on-board electronics know the two batteries are at different charge levels and which is which?
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There will be a wire to the point between the two batteries, which the small microcontroller can measure the voltage of.
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