Says right on the website that it can handle 3s. This is on Losi if the motor is not really 3s compatible.
https://www.horizonhobby.com/product/1-10-ford-raptor-baja-rey-4wd-brushless-rtr-with-smart/LOS03020V2.html
"The truck comes equipped with a Spektrum™ 3800Kv brushless motor and a...