William Sommerwerck wrote:
I had argued that UPS manufacturers would err in favor of
faster charge times just to reduce the user's perceived
"exposure" *after* an outage.

In the Seattle area, an outage is often followed by a restoration, than a
second outage. I've learned to wait to reboot.

Some high-end UPS units, like the APC SmartUPS rack mount ones, will let
you set a turn-on delay for this purpose.