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AGM Batteries

AGM Pro's: Better cycling and depth of discharge over the wet or gell batteries. While most wet batteries are supposed to only go to about 50% depth of discharge, the AGM's are able to go to about 20% depth of discharge without harming them PROVIDED that you don't overcharge them at too high a voltage on their return. What does this mean in numbers? If you have a Golf Cart battery that is 220 amp/hours for both the wet and the AGM, then the AGM would be able to have 176 ah of useful capacity (220 X .80) vs. the wet battery at 110 amp/hours

AGM's need no watering and will receive a charge faster than wet batteries or Gell batteries. How much faster? AGM will charge over twice as fast. Throw Peukert's law out the window: the physical compression of the plates in the cell compartment, when coupled with the better quality of materials in an AGM give it far less internal resistance than the other types. Practically speaking this means less time to recharge your batteries while underway. AGM's can be mounted in any position, require no room for venting and therefore can be installed in living quarter sections of your boat. This can be especially important if you already have a cramped space in mind for your batteries. Also, because of the low internal resistance of the batteries, they were tested by the Coast Guard for their potential for explosion and they passed with flying colors (excuse the pun) by not exploding when heated to 200 degrees f., then dead shorted! So these are some amazing batteries.

AGM's also are virtually maintenance free: although everyone should visually check the terminals and general condition (for swelling, corrosion, black post, or high temperature) of a battery at least every six months. How long will they last? Who knows?

AGM Con's: Price is pretty stiff when compared with the wet lead acid batteries--generally by 2 times. This difference begins to fade if any of the above items listed are important to you: cramped space, no maintenance, difficult mounting, rapid recharge, explosion-proof and non-gassing. Wet Lead Acid Battery Con's: Slower to recharge than AGM, require maintenance more often, and don't cycle as deeply as the AGM batteries. The wet cells need to have space and volume around them to allow the flow, cool and allow transfer of ions and acid back and forth in the liquid solution. ¥ You’ll have something "cooler" than a regular battery: you will have the latest, greatest battery.    ¥ NO hassle of standing on your head to fill 'em with distilled water, sitting in or flicking acid on yourself. ¥ Faster recharge time, less engine or generator run time, safety from explosion, and more storage options. ¥ Longer design life

There! You are, the reasons to buy an AGM battery:


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Designed by John Surrette, the father of modern deep cycle batteries, these batteries have a reputation for heavy duty deep-cycle capacity with a long service life. This reputation has spread worldwide among commercial captains as well as serious pleasure boaters. Rolls Surrette batteries are constructed with techniques which are unique in marine deep-cycle manufacturing. Emphasis is placed on the Rolls Surrette positive plates, since they are the limiting factor in battery service life. Rolls Surrette manufactures it's own materials, which are unavailable to competitors. They do not use commercially available inexpensive automotive grade components.

The heart of the Rolls Surrette battery is their thick high density positive plates. Each Rolls Surrette positive plate is wrapped in fiberglass matting to extend active material integrity during cycling service. This mat holds the active material in place during deep discharges and keeps the plate material from shedding off of the plate. The mat covered plate is inserted into a micro-porous polyethylene envelope to insulate it from the negative plate and isolate it from impurities which may try to contaminate it and shorten it's service life. This unique insulating technique deletes the need for sediment chambers at the bottom of each cell, since any sediment is captured and contained within the envelope. Subsequently, this allows space for taller plates, which increase capacity, adds to battery service life, and accounts for the additional weight of Rolls Surrette Batterie