I have been using deep cycle lead acid and ni-mh batteries and it has become quite clear to me now that a new battery needs to be used quite a few times before its capacity increases to a maximum. this capacity seems to be 50% or more from its new capacity. for instance I have a new 6,800 mah ni-mh battery which is not lasting as long as my well used 4,600 mah ni-mh battery. I would have said that the 6,800 battery was not really this capacity if I didn't know better. the 4,600 mah was also depleting rapidly when new and not storing much charge in the first place. It is the same with my 55 a/h agm battery. When new it was not lasting long at all but now I get a very good result from it after using it quite a few times. I don't know if this is well known or not, but I have never seen anything on it. Does anyone know the reason for this and would I be able to understand the explanation if it is not a complicated chemical engineering problem. a battery is of course a chemical reaction delivering a electric current Anybody else noticed this in batteries and knows the reason? is there any good literature on this giving for instance the number of times the battery has to cycled before it reaches its maximum storage capacity?