Central Scrutinizer wrote:
Carlos E. R. wrote:
On 2014-10-26 07:13, Central Scrutinizer wrote:
And since automotive batteries can typically be obtained from junk yards for only a few dollars (they're happy to get rid of a heavy hazardous material item that has very low scrap value), it's a no brainer to get a couple.
Don't. A battery that has been used to start a car for a year or two has suffered a lot, and doesn't last long in light load use. Charge it, leave it alone for a week, and measure the voltage before and after. It should not change noticeably. If it does, the battery is bad.
I only want a UPS battery to last 5-10 minutes. Anything beyond that is a bonus.
Very few cars are in the junk yard due to a bad battery -- which means a good portion of those batteries are good.
A friend of mine owns and runs an automotive electrical shop.
He buys automotive batteries out of junk yards, charges & load tests them, and sells the good one for US $3 and still makes a profit
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