Mercedes Confirms Battery Failure Behind Antonelli's Barcelona Exit

MercedesTeam·Mercedes technical director James AllisonCoach·James Allison has confirmed that a battery failure caused Andrea Kimi AntonelliPlayer·Andrea Kimi Antonelli’s retirement from last weekend’s Barcelona Grand PrixCompetition·Barcelona Grand Prix. The issue struck just after the Italian had moved ahead of team-mate George RussellPlayer·George Russell for second place, turning a potentially valuable finish into a costly non-score.

Antonelli’s car shut down at the exit of turn five on lap 62 of 66, according to the source report. The timing made the retirement especially painful for MercedesTeam·Mercedes, which had been set up for a strong result before the failure ended the race immediately.

The Barcelona setback came only three weeks after a similar problem forced Russell out of the Canadian Grand PrixCompetition·Canadian Grand Prix, underlining that the team’s reliability concerns are not isolated. According to Allison, the same battery-related area has also affected customer cars using MercedesTeam·Mercedes power units, widening the scope of the issue beyond the factory team alone.

Allison said the failures are not all identical, but he linked them to the same battery component. He added that MercedesTeam·Mercedes believes much of the risk area has now been understood and that a new batch of batteries introduced later in the season could change the picture.

The admission matters because MercedesTeam·Mercedes cannot afford repeated losses at the sharp end of the championship fight. Antonelli’s retirement denied the team a chance to convert track position into points, while Russell’s earlier problem in Canada had already exposed the same vulnerability.

Allison also described the broader engineering response. MercedesTeam·Mercedes is now expected to take a more cautious approach with vulnerable equipment when a new fault appears, reducing stress on parts while another part of the team works to isolate the cause and find a fix. That process, he said, reflects the balance between performance and reliability that teams must manage across a season.

For MercedesTeam·Mercedes, the immediate task is clear: understand the battery issue well enough to prevent another late-race shutdown. With the championship battle still sensitive to every retirement, the engineering department now faces the added burden of proving that Barcelona was an isolated failure rather than the start of a deeper pattern.