float charge: 13.2 - 13.8 volts with the maximum current of one Amp.
rapid charge: maximum voltage of 15.6 volts with no current limit as long as the battery temperature is below 125☏ (~52☌), by battery charger: 13.8 - 15.0 volts, 10 Amps max, 6-12 hours, in the vehicle or boat by the onboard alternator, Since it is optimized for starting/cranking applications, Optima 35 RedTop also features rather acceptable price, when being compared with other Group 35 batteries.ĭepending on its use, Optima 35 RedTop should be charged (according to the manufacturer):
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When compared with other Group 35 batteries, Optima 35 RedTop features low weight, excellent starting features, and good RC, but since it is so lightweight, its 20h capacity is relatively low. But, don't forget that this battery is not intended for deep cycle applications and such use may significantly shorten the battery's operating life. Optima 35 RedTop features very low internal resistance of 3 mΩ, ensuring high CCA and MCA values - 720 CCA Amps and 910 MCA Amps.Īlso, it features 90 minutes RC (Reserve Capacity) value, which is excellent value for 44 Ah battery. Recommended voltage for all Optima RedTop batteries and for BlueTop 34M (also starting battery) is 12.6 to 12.8 which is slightly lower than the recommended voltage for Optima YellowTop batteries and the dual purpose Optima BlueTop batteries of 13.3 - 13.2 volts. Optima 35 RedTop features nominal capacity of 44 Ah and nominal voltage of 12 volts. Note: Optima RedTop batteries are starting automotive batteries, Optima YellowTop batteries are dual purpose automotive batteries, Optima BlueTop batteries with dark gray case are marine starting batteries and Optima BlueTop batteries with light gray case are marine dual purpose batteries. Case color is dark gray, with the red cover color - hence the name. Optima 35 RedTop is maintenance-free battery featuring SAE terminal posts and polypropylene case. In most cases this difference of ~0.3 inches (~0.8 cm) is negligible, but have this in mind when ordering this battery - for short, measure your battery compartment first. Its physical dimensions are (L x W x H) 9.38 x 6.75 x 7.69 inches (~23.8 x 17.1 x 19.5 cm) and is defined as 'Group 35' battery, although it is slightly longer than standard Group 35 battery (L x W x H - 9.0625 x 6.875 x 8.875 inches, 23.0 x 17.5 x 22.5 cm). Optima 35 RedTop weighs 31.7 pounds (~14.4 kg) and is one of the lightest lead-acid BCI Group 35 batteries, with only lithium batteries featuring less weight. Thus, it should be used as starting battery only. Optima 35 RedTop is AGM (Absorbent Glass Mat) SLA (Sealed Lead Acid) starting battery, designed to provide large bursts of energy for short periods of time. Optima 35 RedTop Features and Specifications
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