

| Subject: | Re: Multimeters |
| From: | David Beierl |
| Date: | Thu, 5 Nov 2015 18:41:20 -0500 |
At 05:30 PM 11/5/2015, Anthony Egeln wrote: >I've been looking for a good excuse to buy a >moderately priced multimeter for quite some >time, and I think I may have one now. >Can you use a multimeter to check household >batteries? � I have a box full of AA, AAA and 9V >batteries that my late mother had accumulated, >and while they may be out of date I want to make >sure they are really done before taking them to >our community hazmat pick up this Saturday. � >I was going to buy a "battery checker" on Amazon >and I started thinking that a multimeter might >be able do this just as well and I'd have my excuse to buy the instrument. >There are a lot of recommendations on the >archive for which multimeter to buy, but none >very recent. � I'd love to have a current >recommendation for a moderately priced instrument, digital or analog. >Thanks, Ant Not really. To test a dry cell or dry battery you have to load it with something approximating a working load. Digital meters in general have ten megohms input resistance. My Radio Shack puts a 50 mA load on AAA, 150 mA on AA, C, D cells. 3 mA on button cells and I'm not sure on the rest. Ideally you'd dial in your desired load and cutoff voltage for your particular applications. Yours, David
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