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How about a better example... how about a "size 24F" battery? 24F is a typical example of the BCI (Battery Council International) size specification for OEM-equivalent replacement batteries, that set of specifications being used by auto manufacturers and battery builders alike. AFAIK, the BCI spec for that battery makes no mention of a minimum weight, even though they go into great detail about size requirements. I'd bet the European EN, German DIN, and Japanese JIS guidelines are the same way... no min weight spec.
Now if this doesn't spell out what we mean by battery "size" I don't know what will. We aren't talking rocks, we aren't talking tires, we aren't talking generic definitions, we're talking batteries. My point is, you can indeed have an OEM equivalent battery, same size as defined by battery and automobile builders, and have widely varying weights. Once more - take a look at the earlier posts in this thread for concrete (pun intended :D ) examples.
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And I am with you 100%. I see it reasonable to use 'battery' standards for 'type'. However, for someone to say that you can put a mini battery inside a standard box and call it legal is beyond me. Using the same battery type like your 24F example is EXACTLY what the SCCA had in mind when they allowed somthing other than OEM units.