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All fixedAs short as possible. The real problem is when you adjust the length to fit a certain lipo. Then get for example two 4s CNHL lipos with short cables and nothing fits.
So I like to use 8mm connectors on the ESC without shortening the cables on the ESC. For example QS8 and hammer them out of the plastic. Raz has a video on that.
Then go from the 8mm connector (socket and plug) to the two XT90. So if you ever have to adjust some length or buy lipos with EC5 you just solder the part to the connectors and don't need to remove the ESC in order to solder. Just change cables when you change lipos if necessary. (I have EC5 on the Super Baja Rey and use the same lipos on the Kraton 8s (QS8 connectors) and adjust via 8mm connector.)
Where the yellow circle is you use 6 or 8mm connectors. So you can adjust the rest of the cable according to exisiting batteries. Use heat shrinking tube to fix for a more permanent fit. If you ever use the ESC in another car you can adjust the cables a lot easier using 8mm inbetween.
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If you use capacitors add about 220µF per 10cm cable length. At least two parallel. Here an ESC and capacitors on a 12S printed jet (120mm EDF) for the long cables to the front. On a basher car you must check if all is connected after each driving session. Too much hassle.
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