How and Why Batteries Lose Power
A battery will lose power temporarily as it is discharged. This can be reversed. Recharging restores this power. Permanent power loss results from the effects of slow degradation of the battery components over time. This can not be reversed. Eventually, the battery will need to be replaced.
- Parasitic draws — Small loads that are used to power electrical devices such as digital clocks and electronic control modules when the ignition is off.
- Inactivity and storage — The longer a battery sits the more it will become discharged. The ground cables should be disconnected if the battery is going to be unused for over 30 days.
- Incorrect storage — The battery should always be stored upright to prevent electrolyte from escaping.
- Temperature — Higher temperatures accelerate aging and self-discharge. Lower temperatures slow aging and self-discharge, but the battery delivers less starting power when cold.
- Customer driving habits — Short trips may prevent the battery from being fully recharged, which can damage the battery over the long term. Vehicles such as taxis that sit idling for long periods can generate enough engine heat to damage the battery.
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