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Lithium-ion is a giant leap forward in UPS battery technology and the Liebert® PSI5 Lithium-Ion line interactive UPS is at the top of the class. It delivers up to 50% lower total cost of ownership vs. comparable VRLA battery models, in a smaller, lighter package. The Liebert® PSI5 UPS offers faster recharge times, up to 10x more charge/discharge cycles, and can operate at higher temperatures with no degradation in performance. And it comes with a 5-year warranty, making it a worry-free option.