4 KS 21P, as listed on our Marine and Solar Specification Pages since the first of the year. With the addition of the 4 KS 21P, you can now get up to 1104 AH in one string. No paralleling of multiple strings, less time watering due to reduced number of cells, with an expected life of 15 years and a 10 year warranty.
Repairs are simpler and less time consuming.
Short circuits from water, dirt, and falling metal objects are eliminated due to a moisture tight protective outer cover. The new generation of batteries utilizes dual container construction. The cells are then assembled into a high density tough polyethylene outer container with a removable lid. Even if the outer container were to break the battery would still be operable without the harmful affects of sulfuric acid spills. Optional Cell Connection Cell replacement is now less frequent, but if necessary, Rolls makes it clean and quick.