I'm not trying to take sides or anything, but if it's not labeled, then what would you do windu? It's technically "as labeled by the manufacturer", but it's... not labeled. I would personally play it safe and just not bring it, but you could easily argue both sides.
Sure it would have been clearer for the rule-writing committee to have explicitly stated "the batteries must be labeled", but one of the biggest constraints that people don't consider is that the rules for each event are limited to 1 page (or 2 in the case of tech/physics events) and therefore being as concise as possible when writing the rules is crucial. I have heard of very few instances (not to say that they don't occur of course) of people not using labelled batteries.
Additionally, if the method of verifying the voltage is by the manufacturer label ONLY as stated in the rules, then the supervisor could have penalized you for not complying with the section in the rules specifying what type of battery is being used or the voltage constraint because it can't be verified.
Personally, since I am familiar with R/C batteries and such, I would overlook it at a regional competition and maybe even an invitational if I can immediately recognize what type of battery pack it is and the voltage based on the size and shape of the battery pack, but I would be certain to "scold" the competitors and tell them they need to use batteries that are labeled in the future. I see the purpose of these levels of competitions as learning experiences and if I know that the team will not gain an advantage over other teams, I believe it is fair to let the compete as such. If it were a States competition, I usually check the devices over during impound for violations so I can inform the team that they have a violation that they need to fix so they have an opportunity to try and fix it. If I didn't catch it during impound or the team couldn't fix it, I would most likely tier/penalize according to the rules (not familiar enough with battery buggy rules to know which is the consequence). The implications of a penalty/tier at a state competition can be huge and teams that follow the rules should be rewarded for doing so and those that do not should not be scored similarly.
I have tiered/penalized plenty of teams thus far in my Division D career and have never lost an arbitration because I can clearly point to a section in the rules or to an FAQ/clarification. Arbitration committees are always happy to side with the supervisor in these cases regarding the rules.
Boca Raton Community High School Alumni
Florida State Tournament Director 2020
National Physical Sciences Rules Committee Member
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Circuit Lab Event Supervisor for 2020:
UT Austin (B/C), MIT (C), Solon (C), Princeton (C), Golden Gate (C), Nationals (C)