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I didnt think you could run the feigao 7XL on 20 cells? i thought you needed the BK 20XL series.
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The feigao 7XL is the same as the wanderer 20XL 7 (i heard)the only differ 200 rpm/volt, due to their other measuring, i assumed you could use the wanderer specefications with the feigao's
20 cells = wanderer 8XL and if BK thinks it's okay, you should be able to use the 9920 controller. I personally would use the 36120 controller. You have got the option to upgrade to 24-26 cells and the 2240.
And yes; Feigao measures without load, or they spin the motor and see how much rpm's are needed to reach 1 volt. Lehner measures the motor under load.