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Do they still make those portable power strips for checking batteries? Those were so handy instead of having to use a multimeter.
edit: these little flexible strips:
I got this device when I bought a battery case while switching to chargeables. In bulk they cost about 1,- , so, 5.99 at your favorite DIY store?
Look there it is, in the middle!
Honestly, I'd rather the analog screen that yours has over the digital one I posted. They just tend to hold up better to sitting in a toolbox for a couple years
I just use my multimeter, but im a crane technician and have several very expensive ones and my wifes an electrician so its not uncommon for a multimeter to be nearby
what do you do with that many batteries
Slowly switching over every battery in my house to one that is rechargeable! Lots of old single use batteries rocking on, motion detectors, temp detectors, remote control, bike light... It adds up quickly and I'm not swapping batteries that haven't died yet.
Toys. So many fucking toys.
Daddy's got it
I've got an analogue version of that. Absolutely fucking useless it is. Every device seems to have different thresholds for acceptable levels of power.
It depends on the chemistry. All battery chemistries have different discharge curves. So if you use an alkaline tester with, say, a NiMH battery, it's going to give you some pretty inaccurate readings.
I got one a couple years ago for Christmas. Guess you can still buy them from those mail order catalogs...
But I use it all the time! It's so handy.