Given that the V5 game controller does not have user replaceable batteries, is it permissible to connect it to an external USB power pack during a match. The situation may arise that the team's controller runs out of power during the day and they have not the opportunity to charge it before a match.
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Official Q&A: VRC 2018-2019: Turning Point
42: V5 Controller external power pack
Answered by Game Design Committee
Provided that this external power pack interfaced with the standard micro USB port on the Controller and did not involve any modification to the Controller, yes, this would be legal.