With faster recharges, you have 100% capacity in 2 hours or less in this rack/tower battery backup. This 1500 VA UPS offers longer runtime with up to 7.5 minutes at full-load and 17.7 minutes at half-load. Lithium-ion batteries last twice as long or longer than traditional VRLA batteries. The Lithium-Ion UPS offers low total cost of ownership with fewer or no battery replacements over its lifetime.