Originally Posted by a7az
If you use two six volt batteries in series one of the batteries will become unbalanced over time
A 6V batty is 3 cells @ 2.1V
A 12V batty is 6 cells @ 2.1V
2 - 6V battys are 6 cells @ 2.1V
I dont believe one 6V going "unbalanced" is based on any facts or is any different than eventually one or more cells of a 12V batty going bad as it nears end of life.
The golf cart industry uses different configurations of 6V, 8V and 12V battys in series / parallel very successfully.
Many will say 6V in series is actually better than 12V in parallel to accomp,is the same AH.