> heavily charged/discharged by such events, and therefore has a short lifespan (less than a year, probably, if you used the kind of battery that's in a UPS.)

> heavily charged/discharged by such events, and therefore has a short lifespan (less than a year, probably, if you used the kind of battery that's in a UPS.) But surely such events (i.e. grid power outages) are pretty rare. In Australia it's rare for the power to be out more than once a year.