What a deep cycle battery will do for you than the regular type is give you a longer life for your energy needs than you would have had you chosen to go another way. There is nothing wrong with going with a cheaper option, but in reality you really are not saving any money in the long run because the deep cycle battery will not need to be replaced for up to ten times as long as its competitors. It seems like it is the obvious choice these days to use these when you want to keep your solar power going and not have to go to the store every couple of months.