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I
I told him that I wanted to run (2) 6S 5,000mAh 60C 22.2V batteries in parallel, (I just thought that parallel meant one battery in each tray). He said that would burn-up the XL-X , in parallel or series. To get the fastest speed, without frying the ESC, I should run my 4S 5000mAh 50C 14.4V batteries in "series".
That support rep does not know anything evidently.
You pick your voltage based on the motor you want to run and what the ESC is capable of. Most 8s motors will have the KV value in the 1400 to 1700kv range.
The XLX can run any of those voltages so if packs are in series or parallel the ESC will not know. The XLX will actually see less stress running 6s versus higher voltage on 8s.
When talking parallel vs series.....The difference is the capacity of the batteries being visible to the ESC as 5000 mAh or a 10000 mAh battery providing power. The more capacity the better the batteries can deliver the power needs of the motor and ESC. As mentioned the only draw back would be some extra weight from the second battery pack, but the XLX is used all the time on 1/5 scale 30 lbs RC trucks so there won't be an issue there.
Visual image helps sometimes:
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