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Battery Maintenance

Both maintenance and maintenance-free batteries still need to have corrosion removed periodically.

Maintenance-Free Battery. Many maintenance-free lead acid batteries are permanently sealed with a hydrometer built into the battery casing. An indicator on the top of the battery identifies a battery’s charge condition. Instructions for understanding the indicator are usually next to the indicator.

Maintenance Battery. If a lead acid battery is not maintenance-free, use a hydrometer to check the battery electrolyte’s specific gravity. Warning: Never recharge a battery that has a low electrolyte level or is frozen.