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What are the differences between primary and secondary batteries?
The important difference is the difference in active substances. The active substances in secondary batteries are reversible, while those in primary batteries are not reversible.
The self discharge of a primary battery is much smaller than that of a secondary battery, but its internal resistance is much higher, so the load capacity is lower.
In addition, the quality specific capacity and volume specific capacity of a single battery are both greater than those of individual rechargeable batteries.
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