You are using N40/NS60 size so be careful when they are too cheap. Way back I was working in battery manufacturing firm. Expensive/Good NS60 can have up to 13 plates per compartment, Normal is 11 plates. Cheaper version are 9 plates, not sure if maybe they even reduce them to 7 plates.......lolWet batteries should be much cheaper, I can get my same size for just around rm130-140.