Hello everyone I would like to talk about batteries for our diesels. First off I have had good luck with the A.Z. gold group 49 H8DLG but price is now $170. I also have a Sprinter 05 with a 2.7 engine and the Bosch group 49 is about 54 into the 84 month warranty I did not purchase this battery so I do not think any part of the pro rating would apply to me. This Bosch battery is giving me trouble in that seems if I do'nt run the van for a week it does not have enough power to turn motor over if I jump it and run for 15 min. it will restart so battery seems to be getting weak when I took a cell reading hydrometer they are all weak at about a 1.250 reading 1.260 would be good. When I take a volt reading after fully charging it I get a 12.8 reading which to me is good. So my question is should I not waste any more time on this battery or could it possibly be renewed if I flush and charge with epsom salt and maybe put new electrolite in or maybe try hooking a solar charger on it to keep it constantly charged up? The van does not get used much currently but will in near future. I think even a new battery will go dead in a certain time if not used.