Comment by bxparks
7 hours ago
Three things prevent me from eliminating all alkalines:
* smoke and CO detectors with low-battery voltage sensors calibrated to alkaline
* some older electronics (e.g. multimeters) using 9V batteries
* my non-contact voltage tester refuses to turn on using NiMH, for safety reasons presumably
There are 9V NiMHs, too. They just need dedicated charger.
Yeah, most of the devices using 9V are smoke/CO detectors which only accept alkalines. I don't use the few remaining 9V devices enough to justify buying a new charger.