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I bought one of these because i needed to charge 6v and 12v batteries. It has served me well. I can say on the downside that i'm not sure if it's good as a battery maintainer. It charges the 12v batteries to 14.7v before it reads full with the green light and keeps them at that voltage... i didn't think these sla batteries were supposed to go that high in voltage but it doesn't seem to have damaged the battery in any way and it does take a while to charge... for being 500 mah i figure if i have a 7ah battery to expect it to take 14 hours from dead to full, it takes about 8 to 10. I noticed with my multimeter in the off position it still produces about 2.5 volts... not sure why. It does a better job with 6 volt batteries than 12 volt, again, not sure why... but it eventually reaches full on each. I am pleased with the product and have ordered a second since i have a few batteries i'd like to keep full and am happy with the charger.
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