What Is a Maintenance-Free Battery?


Quick Answer

A maintenance-free vehicle battery is one that is not designed to be opened or refilled. The liquid solution in conventional lead-acid batteries can evaporate, lowering the level in the battery and rendering it inoperable. Sealed batteries use materials to fix the electrolyte in place, removing this necessity.

Continue Reading

Full Answer

Typically, a maintenance-free battery uses a specialized system, such as a glass mat or gel, to absorb and immobilize the electrolyte, preventing it from converting to a gas and escaping the battery. When a conventional battery begins to lose its charge, adding distilled water may revitalize the battery by recovering the plates with electrolyte solution. When a maintenance-free battery loses its ability to hold a charge, however, it must be replaced.

Learn more about Car Parts & Maintenance

Related Questions