Mercedes are preparing to introduce an upgraded power unit package at the Italian Grand Prix as the team looks to eliminate the reliability issues that disrupted an otherwise dominant first half of the Formula 1 season.
The Brackley outfit claimed eight victories from the opening 11 races, with the W17 proving to be the benchmark on the grid. However, despite its impressive pace, Mercedes encountered recurring reliability problems, particularly with the battery system and, to a lesser extent, the control electronics.
George Russell’s retirements in Canada and Kimi Antonelli’s in Spain highlighted the weaknesses of the current package, while Russell also experienced intermittent power delivery issues during several races. Engineers at Mercedes’ Brixworth engine facility later confirmed that a software-related “bug” had contributed to the problems, with a subsequent engine failure during testing in Hungary reinforcing the need for further improvements.
For the past three months, Mercedes has been working on a revised Energy Storage (battery) system aimed at permanently resolving the issues. The new component is currently undergoing extensive bench testing before its planned introduction.
Monza has been identified as the ideal venue for the upgrade. Given the circuit’s long straights and overtaking opportunities, Mercedes believes it offers the best chance to recover positions after the inevitable grid penalties that will accompany the use of a fourth battery, exceeding the allocation permitted under Formula 1 regulations.
The updated battery is expected to be introduced simultaneously on both Russell’s and Antonelli’s cars to ensure equal treatment between the two drivers, even though Antonelli will face a grid penalty at his home race.
Mercedes is also considering introducing additional power unit components at Monza. Antonelli has already used his fourth internal combustion engine this season, while Russell remains on his third. As a result, replacing only the battery would offer little strategic advantage, making a broader power unit update the more logical approach.
Another factor influencing Mercedes’ plans is Ferrari. The Silver Arrows believe their Italian rivals will introduce an upgraded version of their power unit at Monza without incurring penalties, taking advantage of the latest development permitted under the regulations.
With several power-sensitive circuits still to come, Mercedes is determined to maximise performance while ensuring reliability. The team views the Italian Grand Prix as the perfect opportunity to introduce the upgraded battery and potentially revised control electronics, allowing both drivers to exploit the full potential of the power unit for the remainder of the season.
