Yes you need to power up the esc even if your not using the internal bec. If you are using a programming box this still applies, just everything plugs into the box and not the rx. Yes you have to reset it to 4 cell when running the 2 2s packs. You could leave it to auto calculate. It will calculate voltage upon plug in so make sure batteries are fresh or it will not calculate correctly. Some have had problems with auto calculate.
Hope this helps.
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