Li-ion in the data center

We are often asked for our thoughts about the use of lithium-ion (Li-ion) batteries in data center uninterruptible power supply (UPS) systems. This is a relatively new, evolving technology, and there are still a lot of unknowns. In our business, the unknown makes us nervous and uneasy — as it should, because we are tasked with providing uninterrupted power and cooling to IT assets for the benefit of our businesses. That makes us less likely to embrace newer technologies — we prefer to stick with those we feel are tried and tested and allow us to sleep at night.

It’s true, all the failure modes are not fully understood where Li-ion is concerned; they’ll only be known when we see a larger installation base and actual operational performance. Tales of thermal runaway in Li-ion installations give justifiable concern, but any technology will fail if stressed beyond its limits. It’s worth considering the real-world conditions under which UPS systems are used.