Can a user measure voltage with the 41-C series?

[Garth Wilson]

I'm sure it's a simple comparator, basically a 1-bit A/D converter. When the voltage falls below the threshold, the annunciator comes on. I think the only reason to use rechargeable batteries though is if you run the card reader or bar-code reader a lot, or have a 41CL. On alkalines, I used to get two years of battery life with regular use, and it seems to have gone down to about six months after I got the double extended memory module. I can go long periods without having to think about recharging. My annunciator comes on at 1.2V, which would mean it would be on even for fully charged NiCads.