11/21/2023 0 Comments Charging optima batteries![]() In time, AGM batteries, including OPTIMA batteries, may fail. The same may be true for your over-discharged AGM battery. Like a ghost story, sometimes the seemingly dead really aren't dead at all. I "assume" this battery had to be good, since the car was running and driving before the front accident and then it went to auction site. Edited Januby Legacy777Ĭan i use set of jumper cables to hook them together? I'll gladly take any redtops that you want to toss away. I also bolded a few things to point out some misconceptions. Typically we only see issues with charging when it relates to stand-alone deep cycling applications or severely discharged OPTIMA’s.īy using another battery in parallel, it fools the charger into thinking its charging a battery thats got 10.5v. In these applications, most 12 volt chargers (old or newer) or alternators will sufficiently recharge an OPTIMA with at least 10.5 volts. Under normal (engine starting) conditions, an OPTIMA battery should never experience “at rest” voltages below 10.5 volts. ![]() For float charging, we recommend one amp maximum, 13.2-13.8V. It may be necessary to follow the instructions provided in section #3.įor regular charging we recommend a maximum of 10 amps, 13.8-15.0V. However, even some AGM compatible chargers will not recharge deeply discharged (less than 10.5 volts) OPTIMA batteries. Do not use “gel” or “gel/AGM” settings, as they will not fully charge an OPTIMA and could damage it over time. Some have specific AGM settings which should be used to charge an OPTIMA. Most high-quality, modern battery chargers now have built-in features to charge AGM batteries like OPTIMA. If your OPTIMA is discharged below that, the battery charger may not start up. Most basic battery chargers have a built-in function to prevent charging a battery with less than 10.5 volts. All of this can lead to confusion when it comes to recharging a deeply discharged OPTIMA. This benefit also allows an OPTIMA battery to run longer than its specified ratings and run to a lower voltage than typical flooded batteries. A handheld electronic battery tester will most likely provide inaccurate test results.Īn OPTIMA battery has the benefit of very low internal resistance, which allows high amperage output as well as efficient charge acceptance. A deeply discharged OPTIMA battery (less than 10.5V) will not test or recharge properly if treated as a regular flooded battery or gel battery. However, since OPTIMA batteries are frequently used in high-performance applications or non-standard vehicle starting applications, there are certain instances that must be given special considerations.Īn OPTIMA battery is an AGM battery, not a "gel" battery or regular flooded acid battery. To learn more about how charges affect different batteries, click here to read How to Charge and When to Charge?.Under normal vehicle starting applications, most regular automatic lead acid battery chargers will properly charge an OPTIMA. This means the AGM battery would only be able to recharge up to 70%. If you repeatedly only partially recharge an AGM battery, let’s say up to 70% every time, the battery may actually lose it’s ability to fully recharge to 100% in the long term. Smart AGM chargers does that all for you, so you don’t need to worry if you’ve got one of those. ![]() In fact, you’re supposed to slightly over-charge the batteries to give them a “top up”. ![]() Charging AGM batteries requires you to fully recharge the battery. For example, lithium batteries may be partially charged for a while without significantly harming the batteries. For this reason, charging AGM batteries is different and requires special charging procedures. ![]() Laptop batteries are lithium while AGM batteries are lead acid. In fact, the batteries used in laptops are a completely different technology. Many people believe that charging AGM batteries is similar to charging their laptop battery, but of course this is not true. ![]()
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