Castle 9000
#2
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Join Date: Aug 2007
Location: Edmonton,
AB, CANADA
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In series or parallel? Parallel is no issue, you're just increasing the capacity. Series is another matter and will depend on whether the motor and esc can handle 14.8v.
#3
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2s is the max voltage you'd want to feed a Castle 9000. So, 2 2s batteries would only work if used in parallel for more run time, series would be way too much voltage.