I was really surprised to see the massive warning on my new Zooz ZEN37 wall remotes about ONLY using an ancient 5v/1A dumb charger.
The device is apparently missing every conceivable protection needed to comply with USB standards. Even though the charger CAN'T force the device to use more current at the standard 5V (that's TOTALLY on the ZEN37 itself), apparently the device has no protections against drawing too much current, so they demand a very low current charger in case the ZEN37 itself decides to draw too much power (a very backwards way to deal with that kind of design flaw).
And, the default voltage for USB chargers (unless negotiated otherwise with the device) is 5v. Apparently, some crappy chargers don't behave right--but the better ones should only ever put out 5v unless the device asks for a higher voltage.
All this when, for a few cents, the ZEN37 could have a current limiter and a zener diode voltage limiter.
It makes me a bit concerned about the safety of the batteries, if the rest of the design is so lacking.
I'm needing to charge these in my truck topper and the USB outlets it has are most likely not limited to 5v & 1A. Those were a waste of space years ago, since everything I have needs way more power (and decently designed devices that work properly according to USB standards don't have those limitations).
Thoughts?