I have never heard of a lead acid battery having any electronics to balance it's cells, or even any manual way to balance them.
But I think all lithium batteries have, or at least lithium batteries above a certain size.
Why is there this difference between lithium and lead acid batteries?
Let's say I take four 12V batteries and put in series. Would I ever need, or would it be beneficial, to have any balancing, or can I just pretend it is one 48V battery?