Wyze Hand Held Vacuums Dead--yes, plural

I have two Wyze handheld vacuums. They both died at nearly the same time. It’s been a couple months at this point, and I’m thinking about junking them.

One was always plugged into a surge suppressor, and the other only rarely. Neither will take a charge, but the power supplies seem tip-top (32V). Voltage is fine even when plugged into the wall and a battery my meter show no current being draw–in either case–not like they’re browning-out under-load. Displays never come on, simply dead.

Dust cups, filters clean.

Any advice?