If you have have a device that harbors multiple batteries, it would be a good idea to test all of them. Keep in mind that this method only works for alkaline .
The proper voltage for AA/AAA alkaline battery is 1.5V The proper voltage for AA/
We tested alkaline, lithium and zinc-chloride AA's to find the best AA batteries you can buy for. We tested more than 40 individual types of batteries in two discharge modes.. Best AA battery test results best value longest lasting high drain.
This takes time, it wastes energy, each test cycle shortens the battery life and it may not be practical if the battery is in use. It would also be pointless for a primary