mixing batteriy sizes
I have 3 deep cell batteries. One of them is bigger (and newer) than the other 2. What happens if I try to use a big and small one together? What about putting all 3 together?
Forum Discussion
Connecting batteries will equalize them and eventually all will only be as strong as the weakest one. When you connect brand new batteries to used batteries of the same model (never mix and match batteries that aren’t identical in the same bank), the new ones inherit the capacity of the used ones since they must all charge and discharge in unison. So unless your current batteries are only lightly used and are providing nearly 100% of their rated capacity, you will miss out on some of the capacity of the new batteries you buy for expansion.
