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4,005 Posts
You can't check IR without having them under load. Maybe 2 of these in series? http://www.harborfreight.com/100-amp-6-volt-12-volt-battery-load-tester-90636.html
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100 Amp, 6/12V Battery Load Tester
$22 USD on Harbor Freight Tools
Fast and easy to use, this battery load tester checks your vehicle's charging system under working conditions. This load tester takes the guesswork out of electrical diagnosis, making it easy to pinpoint charging system failures.
Test complete charging system including alternator, regulator, and battery. Also tests starter motor for excessive draw.
For use with 6 volt or 12 volt systems
Color-coded voltage meter for easy reading
Heavy duty steel case with enamel finish
Vinyl dipped steel clamps with copper plated jaws
Heavy duty CCA wire
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Joined·3,143 PostsI suspect their tester. You need to do a load test for a few minutes and see how well the voltage holds up. You can get a 100 amp tester for $25: http://www.harborfreight.com/100-amp-6-volt-12-volt-battery-load-tester-90636.html
I was going to use these Walmart batteries for my tractor but there were some reviews that indicated problems:
http://www.walmart.com/ip/EverStart-Maxx-Group-Size-29-Marine-Battery/20531539
I think I might use a slightly more expensive version from Tractor Supply:
http://www.tractorsupply.com/motorc...owaway-battery-st27dc180-4001105#BVRRWidgetID
Or you might consider SLAs which are about $0.16/Wh (but more if you consider Peukert):
http://www.ebay.com/itm/UPG-35AH-12...US_Rechargeable_Batteries&hash=item1c29abbd4c
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