| Electronics > Beginners |
| Small battery tester |
| (1/1) |
| 6PTsocket:
There are plenty of cheap voltmeter testers that apply a load to the AA, AAA, 9V, button cell, etc., and read good, weak, bad. I realize that the load is an approximation of the actual load a battery may have to power might be higher or lower. I would like to build a little load box for my DMM. Is there some reference listing what lists reasonabable test load currents for various small batteries and the percentage of fresh voltage that constitutes good, weak or bad? The project is super simple but I need some data. I am not sure it is on battery spec. sheets. Sent from my SM-G900V using Tapatalk |
| ender4171:
This ANSI doc covers a ton of info for alkaline batteries, including testing methods and measures. I didn't read through the whole thing, but check pages 9-11 for some data. There is likely more later in the document or in related ANSI docs. It's a place to start at least. So are datasheets for "example" batteries of the type you wish to test. PDF Warning: https://www.batterybob.com/Battery-Reference/ansi_c18_1part1.pdf |
| Wimberleytech:
--- Quote from: ender4171 on February 04, 2019, 05:51:52 pm ---This ANSI doc covers a ton of info for alkaline batteries, including testing methods and measures. I didn't read through the whole thing, but check pages 9-11 for some data. There is likely more later in the document or in related ANSI docs. It's a place to start at least. So are datasheets for "example" batteries of the type you wish to test. PDF Warning: https://www.batterybob.com/Battery-Reference/ansi_c18_1part1.pdf --- End quote --- Great reference. Thanks for sharing! |
| 6PTsocket:
ende4171 thanks for that link. It's all there. They suggest several applications for a given cell eg: toy, flashlight, remote, etc. Then they give the estimated load in ma, and ohms for each application and the terminal voltage for that application. For 1.5V alkalines it ranges from .8 to 1volt for end of life. The only trouble is they use industry terminology rather than the common names. An LR3 is what we all call a AAA. With so many types, I should probably make a chart and install a multi turn pot in a little box with a metal pad and one test lead. Switch to ohms, set pot, switch to volts, test. Yes, I know it is a good way to zap the ohms scale in the DMM. Thanks again. Sent from my SM-G900V using Tapatalk |
| Doctorandus_P:
I like this idea for a "small battery tester": The thing itself is a charger instead of a tester, but the idea is still the same. It has 2 magnets that stick to your battery. Discharge currents for testing a battery are not very critical. As you probably already know an (almost completely) empty battery can still have near it's nominal voltage when measured with a high impedance source, but the voltage collapses significantly under any load. Anything between a few mA and an Amp is probably ok, but you may study the documents linked above for more accurate data. |
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