Sainz Handed 10‑Place Grid Penalty After Williams Replaces Race‑Morning Battery

Williams says a fault with Carlos Sainz’s ESME battery forced a race‑day swap that triggered a grid drop and highlights the team’s weekend reliability problems.

Overview

Williams confirmed it replaced Sainz’s ESME battery on race morning and that the change incurred a mandatory 10‑place grid penalty, with the team saying he will start the Belgian Grand Prix from 19th on the grid.
Formula 1 rules limit how many batteries and other power‑unit parts a driver can use in a season, and fitting an out‑of‑quota component automatically carries a grid penalty intended to control costs and reliability.
Motorsport.com reports the replaced item may have been a control electronics module and that this would be Sainz’s fourth such unit of the season, but that specific detail is reported by the outlet and not confirmed by Williams.
Sainz had struggled for pace all weekend and qualified 15th on the road after Q2, leaving the team under pressure and increasing scrutiny of both the driver’s patience and Williams’s performance.
Several other drivers also took out‑of‑quota components this weekend, which reduced the effective impact of Sainz’s 10‑place sanction and reshuffled the starting order; this pattern could influence team decisions on repairs and component use for the rest of the season.