Should I move from VRLA to lithium in my UPS?

SOLiCORE Q8.14. Consider it seriously where weight or floor loading is a constraint, where footprint limits achievable runtime, or where the room runs hot enough that VRLA life is uneconomic. Be more cautious where the duty is pure standby in a controlled room, where the UPS manufacturer will not support third-party lithium, and in New South Wales, where the building fire engineering path for lithium is now materially more demanding. See U6.