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 2025 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.
All battery cells used in the competition must be commercially available. The teams must disclose all data related to the batteries in the Technical Report. This must include a detailed overview of the battery setup and the “materials safety data sheet” which is supplied by the manufacturer. The purpose of this data is to provide Njord with necessary information in case of an emergency. For teams planning on utilizing energy sources other than lithium battery cells, they must contact Njord for further detailed requirements.
The vessel must be sailing within a speed range of 1 to 5 knots. This is important to ensure a safe competition without any unwanted collisions or accidents.