Dull Men's Club
An unofficial chapter of the popular Dull Men's Club.
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Use a search engine, a tradesperson, Reddit, friends, a specialist Facebook group, apps, Wikipedia, an AI chat, a reverse image search etc. to answer simple questions or identify objects. Also see rule 1, “comment baiting”.
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Rechargeable 9v's are a thing I found when randomly searching on Amazon, the ones I found have a USB-C port on the side and are pretty good. Definitely handy for random 9v tools that always seem to be dead when I grab them.
These are amazing for guitars
I wouldn't put those in a fire alarm. Fire alarms are really low-power, long term devices. Perfect for non-rechargable batteries. A lot of rechargeable batteries have some self-draw, meaning, if you leave them out on a shelf for a year, they'll be noticeably emptier.
Yeah, definitely not something for a fire alarm lol, when I said random tools I was actually thinking about my tone test tool. No clue why it uses a 9v but that and my favorite multimeter both need them.
Yeah, I've seen those (though not with the built-in charging; that's cool). Even had some Ni-Cd ones back in the 90s. The only issue I have with using those in things like smoke detectors is having to deal with them more often. I can usually get about 18-20 months out of an alkaline but a Ni-MH one would probably be only like 8 months since the voltage and capacity are both lower.
Well, scratch that. I just found what I think you're talking about, and those are 1300 mAh lithium. Those should last longer than an alkaline. Will keep those in mind next time I replace the smoke alarm batteries.