Hi-tech Maintenance free battery AGM(Absorbent Glass Mat) battery Long lifespan: Electrolyte is completely absorbed by glass mat, which prevent active material lead drop and expand battery life. Ultra stable re/discharge: Higher output. Better cold start: Higher plates, stronger CCA. Anti-spill: Electrolyte can be absorbed in battery avoid from spilling. Maintenance free: Ultra low water loss during negative plates redox, maintenance free.