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A noticeable energy loss occurs if a battery is left in a hot vehicle.High cycle count and aging also increase self-discharge of all systems.Table 3 summarizes the expected self-discharge of different battery systems.Table 3: Percentage of self-discharge in years and months.Primary batteries have considerably less self-discharge than secondary (rechargeable) batteries.The self-discharge of all battery chemistries increases at higher temperature, and the rate typically doubles with every 10°C (18°F).
Primary cells such as lithium-metal and alkaline retain the stored energy best, and can be kept in storage for several years.
Copper dendrites grow if the cell is allowed to dwell in a low-voltage state for longer than a week.
This results in elevated self-discharge, which could compromise safety.
Figure 2 shows the typical loss of a nickel-based battery while in storage. The discharge is highest right after charge and tapers off.
The graph shows self-discharge of a nickel-based battery.