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Group 31 AGM for $50?
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<blockquote data-quote="adulbrich" data-source="post: 8579130" data-attributes="member: 661255"><p>Load testing is the best way to check how good it is.</p><p></p><p>Also, ESR is another indicator of battery condition. I went to an auto show last weekend and met with an engineer from a big battery charger company. He created a handheld device that measures battery ESR accurately for $60! It also "predicts" the cranking power accurately based on ESR, float voltage, and a very small load. It was really cool. If I wasn't extremely pressed for cash right now, I would have picked one up. He said the best indicator of a battery's condition was the internal resistance.</p><p></p><p></p><p>You can be smart and scoop good deals on batteries. I'm selling 4 of my used batteries today for the same price I bought them for 2 years ago. This weekend I'm trading 20 of them and 6 Soundrive 15's for a 2010 250 dirt bike that books at $2,700.</p><p></p><p>I carbon pile load tested 27 of them last week. All but two of them tested in spec, and the two that didn't meet expectations were just low, not bad. Still plenty to start a car.</p><p></p><p>Standard automotive batteries should crank 400+ as a general rule of thumb. A group 31 AGM should crank 500+ or I wouldn't buy it used. My XS D3100 cranked over 1000 amps on out shop load tester.</p></blockquote><p></p>
[QUOTE="adulbrich, post: 8579130, member: 661255"] Load testing is the best way to check how good it is. Also, ESR is another indicator of battery condition. I went to an auto show last weekend and met with an engineer from a big battery charger company. He created a handheld device that measures battery ESR accurately for $60! It also "predicts" the cranking power accurately based on ESR, float voltage, and a very small load. It was really cool. If I wasn't extremely pressed for cash right now, I would have picked one up. He said the best indicator of a battery's condition was the internal resistance. You can be smart and scoop good deals on batteries. I'm selling 4 of my used batteries today for the same price I bought them for 2 years ago. This weekend I'm trading 20 of them and 6 Soundrive 15's for a 2010 250 dirt bike that books at $2,700. I carbon pile load tested 27 of them last week. All but two of them tested in spec, and the two that didn't meet expectations were just low, not bad. Still plenty to start a car. Standard automotive batteries should crank 400+ as a general rule of thumb. A group 31 AGM should crank 500+ or I wouldn't buy it used. My XS D3100 cranked over 1000 amps on out shop load tester. [/QUOTE]
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Group 31 AGM for $50?
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