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my friend explained this to me mathematically yesteday but the math stuff ends up sounding like "blah blah waah wah" after a few mins but pretty much batteries or any electrical component has an internal resistance. you need (im pretty sure his meter said 3.4 it may have been 3.2) volts to overcome the internal resistance before it starts charging.
one advantage to this higher internal resistance is your car wont drain as quickly if you set it down for a few hours.
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