Data centre operators naturally want the best class of available technology, including related batteries, for their UPS systems. Absolute reliability should be combined with energy efficiency, long operating life, and an attractive total cost of ownership.

Currently, the two mainstream UPS battery technologies are lead-acid and lithium-ion (Li-ion). Each has variants; Thin Plate Pure Lead (TPPL) technology, for example, is an advanced, high-performance lead-acid technology available from EnerSys.

This article introduces the strengths and challenges of each of these technologies to potential users. Consultation with a major manufacturer such as EnerSys is then recommended, as they can advise on the optimum balance of performance and economy for a particular application.

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