![]() ![]() Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.įailure to fully charge a battery can result in poor performance and a reduction in capacity. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Overcharging can cause the safety valves to open and battery gasses to escape, resulting in premature failure. When current falls below 1 amp, finish with 2 amp constant current for 1 hour for D34M and 3 amp constant current for 1 hour for D31M.Īlways wear safety glasses when working with batteries.Īlways use a voltage regulated battery charger with limits set to the above ratings. They are designed for engine starting and deep cycling applications and for use in boats with large accessory loads.ġ4.7 volts, no current limit as long as battery temperature remains below 125☏ (51.7☌). Charge until current drops below 1 amp.ġ3.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage). Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125☏ (51.7☌). They are NOT recommended or warranted for use in deep cycle applications.ġ3.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate. These batteries are designed for engine starting applications. Typically, we only see issues with charging when it relates to stand-alone deep-cycling applications or severely discharged OPTIMA batteries.The following charging methods are recommended to insure a long battery life - always use a voltage-regulated charger, with voltage limits set as described below. In these applications, most 12 volt chargers (old or new) or alternators will sufficiently recharge an OPTIMA battery 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 1 amp maximum, 13.2-13.8 volts. It may be necessary to follow the instructions provided in Section #3.įor regular charging we recommend a maximum of 10-amps, 13.8-15.0 volts. 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 battery and could damage it over time. Some have specific AGM settings which should be used to charge an OPTIMA battery. ![]() Most high-quality, modern battery chargers now have built-in features to charge AGM batteries like OPTIMA batteries. If your OPTIMA battery 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 10.5 volts) will not test or recharge properly if treated as a gel battery or regular flooded battery. However, since OPTIMA batteries are frequently used in high-performance applications or nonstandard 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 battery. However, under normal vehicle starting applications, most regular automatic lead-acid battery chargers will properly charge an OPTIMA battery. 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. ![]()
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