Antonelli reveals Barcelona DNF cause as Mercedes plots Austria reliability fixes

Kimi Antonelli has revealed that a sudden temperature spike in a specific component caused the battery glitch that ended his Barcelona Grand Prix, confirming Mercedes will introduce reliability fixes from the Austrian GP. Antonelli will run a new power unit with an updated battery pack in Spielberg as the team scrambles to solve recurring failures that have already cost it vital points in Miami and Montreal.

Why it matters:

Mercedes cannot afford more retirements if it wants to stay in the championship fight. With Ferrari and Red Bull applying pressure, every point counts, and power unit reliability has become a critical weakness threatening the team's title ambitions. Toto Wolff has made it clear that these failures must stop immediately.

The details:

• Antonelli explained the Barcelona failure wasn't purely down to ambient temperatures. A sharp spike in a specific component caused the battery to glitch, with similar issues hitting Russell's car in Canada despite much cooler conditions.
• Mercedes has applied software updates and minor hardware tweaks to the battery pack. These are routine reliability fixes, not linked to the separate ADUO 2026 engine project.
• On strategy, Antonelli defended the two-stop approach in Barcelona, noting simulations showed it was marginally faster than a three-stop, although that calculation assumes clean air.
• Wolff has set clear team order guidelines: if the Mercedes drivers are fighting under rival pressure, the faster car will get priority. When no external threat exists, Russell and Antonelli remain free to race as they were in Montreal.

What's next:

The next four races in five weeks represent a crucial pre-summer break stretch. Antonelli believes circuits like the Red Bull Ring will suit the W16 better than Barcelona, as the team has struggled most on older, low-grip asphalt. The fresh power unit should also help at Austria's high-altitude, power-hungry layout.