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How do primary batteries differ from rechargeable storage batteries?
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battery
Cutaway view of an alkaline–manganese dioxide power cell.
Batteries are categorized into two primary groups based on their ability to be reused: primary batteries and secondary, or storage, batteries.1
- Primary Batteries: These are designed for single use. Once the chemical energy within the electrodes is exhausted and the voltage drops too low to operate a device, the battery is discarded.1
- Storage (Rechargeable) Batteries: These batteries are designed with specific materials and construction features that allow them to be reconstituted. By applying a direct current (DC) voltage that is higher than the battery's original voltage in the opposite direction of discharge, electrons are driven back into the electrodes. This process restores the battery to or near its original energy and power capacity, allowing it to be used repeatedly.12
While storage batteries offer the benefit of reuse, they require careful management. For instance, some systems require precise electronic controls during charging to ensure safety and performance, or they may need specific discharge management to prevent capacity loss, sometimes referred to as a "memory" effect.23