Mercedes have traced George Russell’s recent power loss to a software problem. The fault reduced electrical deployment at Spa-Francorchamps.
Russell completed both Friday practices in Hungary and finished fifth in each session.
Spa exposed the deployment fault
Russell lost electrical assistance while accelerating along Spa’s longest flat-out section. Several cars passed before he reached the braking zone.
The reduced deployment placed him beside Lewis Hamilton on the opening lap. Their later contact ended Russell’s race soon afterwards.
Mercedes first studied Russell’s throttle use and gear choices. The team searched for differences between both cars during the weekend.
Russell changed his driving while engineers compared the available data. Those adjustments did not restore the missing straight-line performance.
The investigation continued after the Belgian Grand Prix. Engineers then found an error inside the power unit software.
Russell said the discovery removed blame from his driving technique. It also gave Mercedes a defined problem to correct.
The battery delivered less energy than expected
Modern Formula 1 power units combine combustion power with electrical energy. Software controls when stored energy reaches the rear wheels.
Russell reached the straight with less useful deployment than planned. The loss became obvious beside cars with normal electrical assistance.
Kimi Antonelli also encountered the Mercedes system problem during the race. His different approach through Eau Rouge reduced its effect.
Antonelli lifted briefly and selected a lower gear before the climb. That sequence changed the energy demand during the critical section.
Russell followed another approach and suffered the larger loss. Mercedes compared both traces while identifying the software fault.
The team did not report a damaged battery or mechanical failure. Its explanation focused on control software and deployment behaviour.
Russell can return to his usual driving process
The uncertainty affected more than one timed lap. Russell repeatedly considered throttle position, gears and energy use while driving.
That extra work distracted him from braking points and corner balance. He described the discovery as a significant mental relief.
A confirmed software cause gives the driver a simpler task. He can again concentrate on extracting speed from the complete car.
Mercedes used Friday practice to check the correction under normal track conditions.
| Driver | George Russell |
|---|---|
| Team | Mercedes |
| Identified cause | Power unit software problem |
| Next event | Hungarian Grand Prix |
Russell drove without the special method used at Spa. Engineers compared his normal inputs with the corrected deployment.
The team also compared Russell’s data with Antonelli’s car during second practice.
Recent weekends changed the title picture
Russell arrived in Belgium after difficult races at Silverstone and Spa. Those setbacks interrupted stronger results from Barcelona and Austria.
He had taken pole position in Barcelona before finishing second. Another pole and victory followed at the Austrian Grand Prix.
The Belgian retirement allowed Antonelli to extend his championship lead. Russell now trails his Mercedes teammate by fifty points.
Russell said the season has tested him more than earlier campaigns. Results have changed through mistakes and problems outside his control.
He also pointed to the many races that remain after Hungary.
Hungary gave Russell an immediate chance to restart that stronger run. The corrected software removed one known obstacle.
The Hungaroring asks different questions
The Budapest circuit contains fewer long full-throttle sections than Spa. Its lap places greater emphasis on repeated medium-speed corners.
That layout does not erase the need for reliable deployment. Drivers still require predictable energy through the main straight.
Russell has previously performed well at the Hungaroring. He secured his first Formula 1 pole position there in 2022.
Mercedes tested the correction across short and longer runs. Both programmes provided deployment data.
Friday helped Mercedes separate power delivery from chassis balance.
Stable deployment would let Russell stop changing his driving around the fault.
Mercedes arrived with a defined repair
The team has not described the issue as a new engine specification. It changed software after finding the faulty behaviour.
Russell expressed confidence that Mercedes had addressed the main cause.
Mercedes compared the track data with its factory tests.
Antonelli’s car offers another useful comparison throughout the weekend. Both Mercedes drivers use the same power unit family.
Russell now knows why his Spa acceleration disappeared. The explanation connects the battery behaviour with the opening-lap loss.
Friday practice provided the first track comparison for the corrected software.
Hungary provides an immediate comparison
The fixed software returns Russell to the same deployment settings used by Antonelli.
Budapest gave Mercedes another race weekend to compare both cars under equal conditions.
Normal electrical output also helps Russell accelerate predictably out of corners.
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