De-sulfating is important for battery life and power.

Whether you are working on a solar energy system, Electric Vehicle, or still driving a gasoline or diesel vehicle, battery power is important and good maintenance of your battery has become more important than ever. Understanding the charge/discharge cycle and having a charging cycle that handles de-sulfating the lead plates can make a major difference in your performance and life of your batteries, even in a simple riding mower. I purchased a de-sulfating system to gain a little experience. It is called a solargizer and connects to your battery with wires that come with it. It also includes a small control box and a small solar panel. It not only provides a small trickle charge to maintain your battery using solar energy, it also provides a voltage spike that helps de-sulfate the plates in the battery not only maintaining the battery, but can also restore some life to an older battery. The web site below explains more about this process. These can often be found on ebay, but take care that there are different size and voltages, so that you find one for your application.

http://www.pulsetech.net/PulseTechnology/PulseTechnology.html