How are non-rechargeable batteries charged in the first place?
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The more difficult question is how do rechargeables get recharged.
A battery, any battery works on the REDOX principle.
Reduction Oxidation.
You have two bits of metal in an acidic solution.
One bit of metal, the anode, gets eaten away by the acid (reduction), the other, the diode, rusts (oxidation). The flow of electrons from one chemical reaction to the other creates an electrical charge.
Rechargeable batteries are able to reverse the chemical reaction to turn the anode to the diode and the diode into the anode
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