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Message: <blockquote data-quote="smoka" data-source="post: 6791410" data-attributes="member: 606721">I don't mean age by old and new, I mean age as in you want to buy batts that were built at the same time. This would provide you the best chance of not having any variation in OCV between the two. If they are not isolated and the OCV's are not exactly the same, then you will have a slow drain from one batt to the next, so you want the batts to be as similar as possible which means they should be built at the same time (matching datecodes).Also for the same reason you want to buy the same group size for all batts. Any difference in plate geometry, paste thickness, plate count, etc will cause variation in the OCV.Of course this is only if you want to get the max life out of your batts. Plenty of people run different brands/sizes of batts together without problems, but it just depends if you want to take that chance.</blockquote>

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