Which battery type uses a glass mat to absorb and hold the electrolyte?

• A. Wet-cell battery
• B. Absorbed Glass Mat (AGM) battery
• C. Nickel-cadmium battery
• D. Lithium-ion battery

Answer: (B)

The key idea is a lead-acid design that immobilizes the electrolyte in a glass fiber mat. Absorbed Glass Mat (AGM) batteries use a fine glass mat placed between the plates, with the electrolyte soaked into the mat. This keeps the acid held in place, making the battery spill-proof and maintenance-free, and it also improves vibration resistance and allows a sealed, VRLA construction—useful for many vehicles. The other types don’t rely on a glass mat to absorb electrolyte: a wet-cell has liquid electrolyte freely circulating, nickel-cadmium uses a different electrolyte and construction, and lithium-ion uses a liquid or gel electrolyte with a different separator system.