@heaviside
My first one was in 2022, and I had to manually charge my device once a week. I started to have some issues with the charging lasting the full week, and they came out with a new one that had a battery ( 5yr life), so I upgraded. The upgraded one within a short time started to malfunction and shock me Periodically. I would have little black marks from it all over my back side, and if you were quite around me you could hear a noise coming from the area of the battery. My new one is great so far and its been almost a full year now. This new one allows me to have x-ray without turning it off, and has a MRI option. This was a big thing for me, as I was afraid if I needed to have urgent medical care and no one knew, the outcome wouldn't be in my favor. The only down side I have is that I get numerous UTI's now( about a dozen each year). so I'm constantly on Nitrofurantoin Monohyd to clear them up quickly.
Even with everything, I'm beyond happy with my choice.