How are non-rechargeable batteries charged in the first place?
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A battery uses chemical reactions to produce energy. (or rather turn chemical energy into electrical energy)
A non rechargeable battery is assembled using chemicals/materials that will react to produce electricity, however once that chemical reaction has finished processing all the original chemicals into new ones the battery is spent.
A rechargeable battery is very similar, except the chemical reaction can be reversed by forcing electricity back into the battery, ie recharging it.
Different combinations of chemicals yield different results. Some can be reversed easily by applying power, others cannot. Some are easy to produce with household goods, others take extensive processing with dangerous ingredients and machinery. Plenty of other factors at play as well.
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