https://www.amazon.co.uk/Lithium-Rechargeable-Battery-Capacity-Constant/dp/B08C7SQTMW/These basically.
Advantages as discussed, plenty of keyboards and mice I have, have rejected Duracells at 1.2V and only a few months. It almost felt criminal throwing them out.
The downside is, for devices that don't have a battery warning system, these simply "appear" to cut out, dead. You cannot, for example, like normal AA/AAA cells switch them around or hold them in your hand for a while to get another hour out of them. When dead, they are 100% dead.
They come with USB splitter cables to change 2 or 4 at a time. They only charge at low rates, 100-200mA.
Honestly though, the AAA cells are probably not worth it. They suffer low capacity and as they commonly get used in keyboards and tend to run out at the least useful moment, I have trended back to normal AAAs. I still use these USB Rechargable AA cells in mice etc. though.
I was going to trial run one in the basic wall clock to see how long it will run it for. Not the typical application, but I expect rather than run slow for a few weeks before it stop, it will just be bang on time until it stops dead.