with the Chritmas tree bump ups you have an a an b side so for example
1/16th a final runs the first say 2 in this then move to the a 1/8th final.
the 1/16th b final then then runs this allows the 1/16th winners time to charge and so it goes on.
Rob has explained it better on the Proline dirt section on here.
So even if you run Nicads you can still do Bump ups in this mode
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