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Posted by gmharris [70.129.56.37] on Thursday, February 24, 2011 at 14:13:33 :
In Reply to: Re: ?WHY IS OPTIMA BATTERY BETTER? posted by Kaegi [71.227.129.92] on Thursday, February 24, 2011 at 12:43:46 :
You can get a completely dead AGM battery to charge by hooking in in parallel to a good battery or by using a jump start instead of a charger.
Here's the Optima explanation:
Like a ghost story, sometimes the seemingly dead really aren't dead at all. The same may be true for your over-discharged AGM battery.
In time, AGM batteries, including OPTIMA batteries, may fail. Failures are typically caused when a starting battery is used in a cycling application, in which a deep cycle battery is the better choice.
Okay, so now you have a seemingly bad AGM battery, you attach it to your charger and…CLICK. The charger won't even charge it! "It must be a bad battery!" you exclaim. Or is it? In many cases, OPTIMA batteries that are assumed to be bad may actually be perfectly fine, just deeply discharged.
The great thing about AGM batteries, including OPTIMA Red Top® and Yellow Top® batteries, is that they have incredibly low internal resistance. This allows very high amperage output and for the battery to accept a charge very quickly.
An AGM battery, with its low internal resistance, may stump car guys because sometimes it doesn't work like a traditional flooded lead acid battery.
Here's the problem: most battery chargers have built-in safety features. A traditional battery that's at 10.5 volts or less is seen as defective, having either a short, a bad cell or some other defect. The charger "knows better" than to charge a defective battery because the results could be unsafe. But the fact is the AGM battery is just fine; it has simply slipped below the minimum voltage threshold of the charger and the charger doesn't know what to do with the battery
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