Originally Posted by GallenH
For those of us who might want to add battery capability: I've read that with AGM and flooded LA batteries, you don't want to just add a battery; but replace the existing battery(ies) at the same time. Can't remember the reason but it seems like a rule of thumb, correct? Can someone explain why. Also, if your batteries were Lithium, would the same rule apply?
I've also heard that it's best for all your batteries to the same size, make, and age. Probably for proper balance in the charging.
As to the lithium part of your question; most have internal Battery Management Systems (BMS). But I wonder if the BMS would compensate for mixing new batteries with used ones with a few hundred recharge cycles on them. I have no clue on that one.
Good question. I always thought I could later add more lithiums of the same kind to the two in my recent conversion. Now I'm not so sure.