Originally posted by Texas Grown
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A standard deep cycle marine battery needs to be recharged pretty quickly after being partially discharged. Otherwise, over time they do in fact start to loose their capacity.
A golf cart type of wet cell deep cycle battery on the other hand won't have as bad of a time loosing capacity if not fully recharged.
I have seen mixed results from a sealed AGM type of battery. The Hawker batteries that I mentioned earlier in this thread for example, I bought them used in 2009. At that time, they were 9 years old and I was told by the previous owner that they had been sitting in storage for at least a year. I tested both batteries and they showed 11.2 and 11.5 volts. However, after charging them, both batteries have shown normal capacity and are still working fine today.
With that said, the batteries used in mobility scooters are sealed AGM type batteries and quit often is the case that they go bad because they get partially drained and are never fully recharged.
I strongly believe too that the quality of the battery has a lot to do with how well it performs over time. The cheaper batteries just won't last unless you baby them. The higher dollar batteries will pay off in the long run by not having to replace them every couple of years.
So, unless you have the capability of really watching over the batteries and making sure they get recharged fully, a higher quality (not necessarily higher dollar) battery will work best.
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