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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