Redbeard51 Posted August 25, 2014 Share Posted August 25, 2014 Sorry I am sure this has been talked about, but I cannot find it. Which deep cell or marine battery at Cosco is the correct number to get for the Sunrader??? Quote Link to comment Share on other sites More sharing options...
Vanman Posted August 25, 2014 Share Posted August 25, 2014 Take inside measurements of your battery well and consider the entry door size if different. Get the biggest one that will fit in there. One consideration might also be what kind/size of convertor/charger on your rig.john Quote Link to comment Share on other sites More sharing options...
Maineah Posted August 25, 2014 Share Posted August 25, 2014 If you find two that are the right size and can't decide pick them up and buy the one that is the heaviest it will have more plates. Quote Link to comment Share on other sites More sharing options...
BobBeery Posted August 26, 2014 Share Posted August 26, 2014 Your existing battery probably has a size designation on the top, such as 'group 27.' you most likely will have to pull the battery out or almost out of the box in order to see it.. Quote Link to comment Share on other sites More sharing options...
linda s Posted August 26, 2014 Share Posted August 26, 2014 My Sunrader has the box on the side of the camper on the driver side. It will hold a group 27 but I only use a 24 cause of the weight. Too hard to get it out of there to check the water. I think the battery boxes in the back, middle of bumper area are bigger and might hold a group 31. Go with the largest one you can handle Linda S Quote Link to comment Share on other sites More sharing options...
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