All batteries must be sealed to reduce the hazard from acid or caustic electrolytes. The open circuit voltage may not exceed 60V [DC]. During the 2022 competition, Njord will be able to lend batteries to participating teams. The reason for this is to simplify the transport of the team's vessels to Trondheim, and to ensure that the batteries comply with safety standards. The teams are not required to utilize the provided batteries, but are responsible for ensuring that their chosen batteries are within safety requirements. There will be professional personnel present at the competition approving the teams’ power supply arrangement before teams are allowed to compete.