USB-A is alright for charging small electronics. It's 5V and somewhere between 0.5A and 2.1A (1A is very common).

I have charging cables (with USB-A on the power side) in multiple places around the house, using the 5V/1A adapters that shipped with iPhones over the years. This works fine, though it is slower than the "fast charging" we've grown to expect these days.

The device end of these cables are miniUSB (bicycle lights), microUSB (external battery pack), USB-C (my partner's noise cancelling headphones), and many of them are Lightning (Airpods, Airpods Max, iPhones, iPads, Apple TV Remote).