Flooded Batteries
Flooded lead acid batteries have the longest track record in solar electric use and are still used in the majority of stand-alone alternative energy systems. They have the longest life and the least cost per amp-hour of any of the choices. However the other side of the coin is, in order to enjoy these advantages, they require regular maintenance in the form of watering, equalizing charges and keeping the top and terminals clean. Some examples of flooded lead-acid batteries used in solar and wind electric systems are 6 volt golf-cart batteries, 6 volt L-16's and 2 volt industrial cells for large systems.
Here you can find a big selection of low priced flooded solar batteries from all the top brands including MK Battery, Deka Solar, Hawker, Trojan, Rolls, Outback Power, Xantrex and Concorde.