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What they have ruled is reasonably logical given that the Q&A is solely for clarification of rules, and as the rules stand a battery with cables attached is a modified COTS item. There is nothing to say that there won't be a team update excluding batteries from the withholding weight. If the GDC doesn't limit itself to only interpreting rules in the Q&A, and leaving changes for team updates then the whole system breaks down. The various channels have their purposes, and the Q&A's is to clarify existing rules.