What makes one battery rechargeable and another not?
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There are two types of battery, primary batteries and secondary batteries.
The first are not rechargeable, they employ a chemical reaction that releases energy over time but isn’t reversible, once it’s discharged the reaction is complete and it’s not worth it to use electricity to reverse the reaction and obtain the original reagents.
The second type is rechargeable, their structure allows them to dispense energy through an electrochemical process, but that process is reversed easily by applying current to them, charging them once more.
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