Optima BlueTop Marine Batteries

These deep-cycle, 12-volt marine batteries feature Spiralcell technology. The constant vibration and jarring from waves can be deadly for traditional marine batteries.
The tightly-wound construction in Optima BlueTop Batteries minimizes plate movement and subsequent damage caused by harsh conditions, thus extending battery life. The batteries are leakproof so they can be mounted in almost any position inside your boat. They require alternator voltage between 13.8 and 15.0, and they can be float charged at 13.2-13.8 volts with a 1 amp max.