I run 5 cells in a B4 and a BJ4 and I run 5.5 in both. You have to adjust the power curve and the gearing to suit though. I run the B4 on 17/81 and it's not really slow.
Have a fiddle with your setups too, because you can do a lot more with weight distribution now.
You can get a 6.5 to work, just gear the crap out of it and turn up the punch on your speedo.
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