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#4629289 - 01/09/18 01:16 PM Small Battery Tester - 9V, AA, etc.
dishdude Offline


Registered: 11/14/08
Posts: 8754
Loc: Phoenix
I ran into an issue using my DVM to test batteries. I had a 9V putting out over 9V, but when a load was placed on it, it fell flat on it's face and couldn't power the device it was in. I had another 9V putting out 8V and it worked just fine. This is making me question the AA batteries I was testing that were doing the same thing.

Will something like this load test the battery and be more accurate? Just looking for 9V, AA and AAA.

https://www.homedepot.com/p/Commercial-Electric-Electric-Battery-Tester-MS602H/202353291

_________________________
2018 Challenger SRT

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#4629316 - 01/09/18 01:49 PM Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude]
zzyzzx Offline


Registered: 05/18/12
Posts: 4372
Loc: Baltimore, Maryland, USA
I have seen VM's that have a batery test feature where they put a 200ma load on the battery and display the voltage.

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#4629340 - 01/09/18 02:13 PM Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude]
barryh Offline


Registered: 01/09/16
Posts: 312
Loc: Cheshire, England
I made my own by soldering a suitable load resistor across a battery connector so that a small load was applied when the battery was inserted. The voltage could then be read off with a normal digital meter. Cost nothing as I already had the parts.
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1979 BMW R45 (Triple QX 5W40)
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#4629352 - 01/09/18 02:32 PM Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude]
Tdbo Offline


Registered: 08/18/09
Posts: 3227
Loc: Ohio
I like this one:

https://www.homedepot.com/p/Gardner-Bender-D-C-AAA-AA-9-Volt-Battery-Tester-GBT-3502/202867877?cm_mmc=Shopping%7cTHD%7cG%7c0%7cG-BASE-PLA-D27E-Electrical%7c&gclid=EAIaIQobChMIm7iDy9zL2AIVRLXACh0Ptgl2EAQYASABEgKpU_D_BwE&gclsrc=aw.ds&dclid=CKHG583cy9gCFUmvTwodctELGQ

Quick, easy, fast, and cheap. Paid $3.00 for mine on sale @ Menards.
_________________________
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#4629409 - 01/09/18 03:42 PM Re: Small Battery Tester - 9V, AA, etc. [Re: barryh]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35876
Loc: Great Lakes
Originally Posted By: barryh
I made my own by soldering a suitable load resistor across a battery connector so that a small load was applied when the battery was inserted. The voltage could then be read off with a normal digital meter. Cost nothing as I already had the parts.

Yeah, if you have some resistors sitting around, you can just use your existing DMM.

I'm thinking something around 10-15 Ohm should work for 1.5V batteries, and maybe 50 Ohm for 9V.
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#4629551 - 01/09/18 05:38 PM Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude]
eljefino Offline


Registered: 06/15/03
Posts: 32640
Loc: ME
You don't even need a resistor, just use an old incandescent flashlight bulb or maybe even a 194 12V marker bulb.

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#4629559 - 01/09/18 05:47 PM Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude]
dishdude Offline


Registered: 11/14/08
Posts: 8754
Loc: Phoenix
So my thinking was correct, a DVM shouldn't be used to check a battery's health and these little battery meters do have a bit of resistance built into them?
The resistor and bulb in series with the DVM are great ideas.
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2018 Challenger SRT

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