I think "battery location" would refer to any move outside the engine bay, although tie-down requirements would apply to moves within the bay.
These rules are enforced to varying degrees at different tracks. If you have a specific track you plan to mostly run at it would be well worth your time to drop by and talk to a couple of the tech inspectors. Also be aware that their rules may be different for open run-what-you-brung type racing vs. sanctioned events. And if/when you want to do a little autocrossing, NHRA compliance would put you in good shape for that as well. Battery relocation is really pretty simple. I mean you are working with nice fat wire, nuts, bolts, power drills. I figure any job that doesn't require a torque wrench is pretty basic
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Our local track banished my son's 240 for lack of a kill switch but once that was installed and the battery was J-bolted to the frame they had no problem with his $10 unsealed and unvented plastic battery box! I used to have a battery in the trunk of my old Si in a wood box that was bolted to the frame and vented. But they never said boo about a cut-off switch back then.