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In time, AGM batteries, including OPTIMA® batteries, will fail. Premature failures are often caused when a starting battery is used in a cycling application, for which a deep-cycle battery is the better choice.
OK, so 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. Jixipix pastello pro 1 1 117. Or is it? In many cases, OPTIMA batteries that are assumed to be bad may actually be perfectly fine, but just deeply discharged.
The great thing about AGM batteries, including OPTIMA REDTOP® and YELLOWTOP® batteries, is that they have very low internal resistance. This allows very high amperage output, allowing your battery to power your accessories longer and deeper than a traditional battery, but at the same time deeply discharging it.
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: Many battery chargers have built-in safety features that may prevent chargers from recharging deeply-discharged batteries. A traditional battery that's at 10.5 volts or less may be seen as defective, having either a short, a bad cell or some other issue. Many analog chargers are binary and are either on or off. If they don’t turn on, it may be because the charger thinks the battery is “bad.” Turning on to charge a “bad” battery could create an unsafe scenario. But the fact is that the AGM battery may be just fine; it has simply slipped below the minimum voltage threshold of the charger to turn on, and the charger doesn't know what to do with the battery, so it does nothing.
Here are three options for bringing that deeply discharged AGM battery back to peak operational performance.
Recovery Option #1: The Best Solution – AGM-Specific Chargers
The best method for recharging a deeply discharged AGM battery is to purchase a modern charger that has kept up with battery technology. Many chargers now have AGM-specific settings and desulfation steps that help recondition and recover deeply-discharged AGM batteries. These are becoming more common, and they work well for all lead-acid batteries. They have the additional capability of doubling as a battery 'maintainer' for batteries in storage. Some come with additional ring terminals to permanently attach to your battery leads so you can charge the battery externally with an accessible charger or maintainer. This makes it easy to hook up when you store your car, truck, boat or RV.
The OPTIMA Chargers Digital 1200 12V Performance Battery Charger and Maintainer enhances the performance of OPTIMA and other AGM batteries, recovers deeply discharged batteries and extends battery life. The OPTIMA Chargers Digital 1200 12V Performance Battery Charger and Maintainer is optimized when used with high-performance AGM batteries, but has enhanced charging capabilities that can also be used with all traditional types of automotive batteries.
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This is the preferred method of charging a deeply discharged battery and you can buy one here.
Recovery Option #2: The DIY solution for charging a deeply discharged battery.
This is a recovery method for the do-it-yourselfer using the equipment you have in the garage. With this option, you're going to 'trick' your traditional charger into charging the deeply-discharged AGM battery.
Here's what you need:
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- Battery charger (under 15 amps)
- Jumper cables
- A good battery, preferably holding voltage above 12.2 volts. (It can be an AGM or flooded lead-acid battery)
- The seemingly dead, deeply-discharged AGM battery
- A voltage meter
- A watch or timer
Here's what you do:
Hook up the good battery and deeply-discharged AGM battery in parallel – positive to positive and negative to negative. Do not have the charger connected to the battery or turned on at this stage.
Next, connect the discharged battery to the charger, then turn on the charger. The charger will 'see' the voltage of the good battery (connected in parallel), and start delivering current.
After the batteries have been connected for about an hour, check to see if the AGM battery is slightly warm or hot to the touch. Batteries naturally become warm during charging, but excessive heat may be an indication that there really is something wrong with the battery. Discontinue charging immediately if the battery is hot to the touch. Also discontinue the process if you hear the battery 'gassing' — a hissing sound coming from the safety valves. If it's hot or gassing, STOP CHARGING IMMEDIATELY!
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With your volt meter, check back often to see if the AGM battery has charged to 10.5 volts or above. This generally takes less than two hours with a 10-amp charger. If it has, disconnect the charger from the wall outlet and remove the good battery. Now, connect only the deeply-discharged AGM battery to the charger. Turn on the charger and continue until the AGM battery reaches a full state of charge (at least 12.6V), or until the automatic charger completes the charge process. In most cases, the AGM battery will be recovered.
Recovery Option #3: Enlist the Professionals
If you don't own a battery charger, don't want to make the investment or you're not the do-it-yourself kind of person, this is the option for you.
Take the battery to a professional battery specialist who knows AGM technology. Most specialists are willing to provide 'charge and check' procedures free or for a small fee. Auto parts stores are typically not capable of accurately determining an AGM battery's condition and many use conductance testers that don't provide correct readings. Battery specialists (such as Interstate Batteries and other independent battery distributors) are experts who can help determine if your battery is recoverable or not.
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Recharging an OPTIMA battery
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Options for recovering an OPTIMA battery that is difficult to recharge.