Speaking on the eve of the Le Mans Test Day, Jani said that the decision had been taken in the name of reliability.

So far this year in the WEC, Audi has won both races on the road but lost its Silverstone win to Jani’s #2 car – which he shares with Romain Dumas and Marc Lieb – for a technical infringement.

At Spa, the #2 Porsche finished second, despite running for almost the entire race without its hybrid power.

“We changed the battery because we had a problem with it,” Jani told Motorsport.com. “We came back to the 2015 spec to be safe, for reliability is paramount here.

“At the end of the day, there's no point being one second faster if the car ends up breaking down. So we came back to that. But you never know.”

Since Spa, Porsche has been endurance testing at Aragon in Spain, and despite it having the fastest car in the WEC, it is reliability which is its big question mark going into Le Mans.

“This year, everyone can win,” Jani added. “Our tests at Aragon were good. But nothing is guaranteed, especially on this track where you can't run beforehand.”