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Small Battery Tester - 9V, AA, etc. #4629289
01/09/18 01:16 PM
01/09/18 01:16 PM
Joined: Nov 2008
Posts: 9,273
Phoenix
dishdude Offline OP
dishdude  Offline OP
Joined: Nov 2008
Posts: 9,273
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 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude] #4629316
01/09/18 01:49 PM
01/09/18 01:49 PM
Joined: May 2012
Posts: 4,530
Baltimore, Maryland, USA
zzyzzx Online sleepy
zzyzzx  Online Sleepy
Joined: May 2012
Posts: 4,530
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.

Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude] #4629340
01/09/18 02:13 PM
01/09/18 02:13 PM
Joined: Jan 2016
Posts: 333
Cheshire, England
barryh Offline
barryh  Offline
Joined: Jan 2016
Posts: 333
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.


Barry

1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (Shell Helix Ultra 5W40)
Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude] #4629352
01/09/18 02:32 PM
01/09/18 02:32 PM
Joined: Aug 2009
Posts: 3,292
Ohio
Tdbo Offline
Tdbo  Offline
Joined: Aug 2009
Posts: 3,292
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.


2012 Honda Accord LX-P 94K
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Re: Small Battery Tester - 9V, AA, etc. [Re: barryh] #4629409
01/09/18 03:42 PM
01/09/18 03:42 PM
Joined: Oct 2002
Posts: 36,590
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,590
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.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude] #4629551
01/09/18 05:38 PM
01/09/18 05:38 PM
Joined: Jun 2003
Posts: 33,550
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,550
ME
You don't even need a resistor, just use an old incandescent flashlight bulb or maybe even a 194 12V marker bulb.

Re: Small Battery Tester - 9V, AA, etc. [Re: dishdude] #4629559
01/09/18 05:47 PM
01/09/18 05:47 PM
Joined: Nov 2008
Posts: 9,273
Phoenix
dishdude Offline OP
dishdude  Offline OP
Joined: Nov 2008
Posts: 9,273
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.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI

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