A little black box with an analog meter on the front, atop a box of batteries.

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   Waldo Jaquith (waldoj@mastodon.social)'s status on Monday, 26-Dec-2022 11:02:27 JST Waldo Jaquith

   I highly recommend having one of these little battery testers. Any time I have a disposable battery of a mystery status, I can quickly figure out whether it should be kept, tossed. (For a couple of years I saved old batteries to be recycled, but repeated exhaustive searches revealed that recycling is impossible here.)