Yes, you are allowed to relocate
9.3.8. BATTERIES
Battery location is unrestricted within the bodywork (except Spec Miata, Touring 2-4, B-Spec, and Improved
Touring). If located in the driver/passenger compartment, vented wet cell batteries shall be in a nonconductive
marine type container or equivalent. The hot terminal shall be insulated on all cars. All batteries (on-board
power supplies) shall be attached securely to the frame or chassis structure independent of the marine type
container.