Charges faster than conventional chargers with much higher ratings Intelligent and efficient technology charges batteries faster than conventional chargers. Charges batteries faster than other chargers with similar ratings. Finally, several unique and innovative features have been included, such as a backlit LCD display, a USB charging port for phones and other devices (on the Digital 1200 only), an integrated power cord and charging clamp storage, and an integrated work light on the charging clamp (on the Digital 1200 only). There are several innovative features to prevent overcharge, even in the event of battery failure. The OPTIMA Chargers Digital 400 and Digital 1200 12V Performance Battery Chargers and Maintainers will safely charge and maintain your battery even during long-term storage with automatic restart in the event of power disruption or temperature-compensated charging. The safety of OPTIMA chargers is also class-leading, with reverse polarity protection, spark-free connections and over-temperature protection. This algorithm allows the OPTIMA Chargers Digital 400 and Digital 1200 12V Performance Battery Chargers and Maintainers to charge batteries faster than most battery chargers of similar size, and to charge faster than chargers with up to twice the current (amps) output. For military, commercial applications or new equipment design, please contact OPTIMA for additional technical information and assistanceĪs a division of the world's largest battery manufacturer, OPTIMA is able to leverage significant engineering resources and data to develop a superior battery-charging algorithm.
These guidelines are intended for typical consumer applications. Failure to fully charge a battery can result in poor performance and a reduction in capacity. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately. 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. Always use a voltage-regulated battery charger with limits set to the above ratings. Always wear safety glasses when working with batteries. 6.6 to 6.9 volts, one amp maximum current, time indefinite (at lower voltage). Charge until current drops below one amp. Maximum 7.8 volts (regulated), no current limit as long as battery temperature remains below 125☏ (51.7☌). 6.9 to 7.5 volts, 10 amps maximum, for approximately six to twelve hours. 
When current falls below one amp, finish with two-amp constant current for one hour for D34M, and three-amp constant current for one hour for D27M and D31M.
14.7 volts, no current limit as long as battery temperature remains below 125☏ (51.7☌). They are designed for engine starting and deep-cycling applications, as well as for use in boats with large accessory loads. They are NOT recommended or warranted for use in deep-cycle applications. These batteries are designed for engine starting applications. When current falls below one amp, finish with three-amp constant current for one hour. They are designed for engine start and deep-cycle applications for use in vehicles with large accessory loads. OPTIMA COMMERCIAL YELLOWTOP CHARGING INFORMATION 13.2 to 13.8 volts, one 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☌). When current falls below one amp, finish with two-amp constant current for one hour. 13.8 to 15.0 volts, 10 amps maximum, for approximately six to twelve hours. 13.65 to 15.0 volts, no amperage limit. They are designed for engine start and cyclic applications and for use in vehicles with large accessory loads. Always use a voltage-regulated charger, with voltage limits set as described below. The following charging methods are recommended to ensure a long battery life.
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