Mercedes has identified the underlying cause behind a series of costly retirements that have disrupted its championship campaign, with a battery-related issue emerging as the common thread linking setbacks for both George Russell and Kimi Antonelli.
The discovery comes after a damaging run of reliability problems that have robbed the team of valuable points at a crucial stage of the season.
Russell was forced out of the Canadian Grand Prix while leading the race, before Antonelli suffered a similar heartbreak in Barcelona last time out when he retired from second position.
Now, Mercedes technical director James Allison has revealed that the team has pinpointed the source of the problem and is working urgently on a long-term remedy.
Battery issue identified as common factor
While Mercedes has endured different reliability failures across its fleet this season, Allison explained that the recent incidents can be traced back to the same general area within the power unit's battery system.
“I think anyone who's a keen watcher of the sport will have seen that this has laid a few Mercedes engine cars low over the season so far,” Allison said on Mercedes’ Nu Silver Arrows Radio Show.
“They're not all identical, but they do sort of originate in the same broad part of the battery.
“I think that most of the areas of risk have been understood. And with a bit of luck, when we start to sort of phase in the new modules into the racing season – we call the battery 'the module' – then our fortunes as a fleet should pick up.
“Obviously for us, that's an important thing. These DNFs are very, very painful.”
The failures have not only affected Mercedes' works operation. Customer team McLaren has also encountered electrical-related issues throughout the campaign, underlining the importance of finding a robust solution as quickly as possible.
For Mercedes, the consequences have been severe. The retirements in Canada and Spain alone have significantly reduced the team's advantage in the Constructors' Championship and served as a stark reminder that reliability remains as critical as outright pace in modern Formula 1.
Why reliability failures still happen
Although Formula 1 teams invest enormous resources into testing and simulation, Allison acknowledged that failures can still emerge once components are subjected to the extreme demands of race weekends.
“You accept that there will be failure. We try to make sure that failure happens in testing or on rigs and that it happens as little as possible when you're out there trying to earn championship points,” Allison said.
“Now, clearly it doesn't always work because occasionally the car will DNF and that is definitely a failure of our process and all of our attempts to deliver performance without the downside of that performance.”
The Mercedes technical chief explained that when a weakness is first discovered, teams often take a conservative approach while engineers work behind the scenes to understand the root cause.
“But when a failure like that does happen, then in the first instance and perhaps before it's fully understood, then the team will tend to take a slight half-step backwards to be more cautious with the equipment, to push it slightly less hard, just to give a little bit of resilience to the kit that's obviously suffering.
“But a different part of the team will try to figure out what was the root cause of that failure to design that out, prove that out and put something back on the table that is sufficiently robust.
“So you do a first intervention that is just to try to sort of give the vulnerable thing an easier life while then working on a proper cure that lets you really cane it.”
Read also: Mercedes withdraws Russell Monaco GP right of review
Those comments offer a glimpse into the balancing act now facing Mercedes. The team must protect itself against further retirements in the short term while simultaneously developing a permanent fix capable of withstanding the relentless demands of Formula 1 competition.
With four race weekends scheduled across the next five weeks, beginning with the Austrian Grand Prix, time is of the essence. Mercedes believes it has identified the problem and understands the risks, but until the upgraded battery modules are introduced and proven in race conditions, caution is likely to remain the watchword.
For a team chasing world championships, the warning signs could hardly be clearer: speed alone is not enough if reliability cannot keep up.
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