5S or 4S

[tom255]

I bought BK9920 and 9XL motor. I thought before that i build Savage but i got good ofer for my Savage and sold it and bought HB LSP. So i need ur suggestion.

I thought to use 8000mah lipo 4S but i think how it perform on LSP i want archive at least 35-40 mph for my local track its enough.
2 options what u prefer? Honestly i want use 4S its cheaper and lighter

1. 4S2P 8000mah lipo gear higher 9XL to archive 35-40
2. 5S2P 8000mah lipo gear normal 9XL to archive 35-40

I want to know which option more harmful in thermaling spot, i suggest with lower voltage its draw more amps its means more heat on motor

What you think can i use 1st its cheaper for me becouse i want to use spare Lipo so it makes more than $100 difference if i take additional warranty.