Nyck de Vries took Mercedes to the top of the Formula E times in a tame second practice session at Tempelhof Airport ahead of the Berlin E-Prix.
The abrasive surface meant drivers left it late to switch to the full 250kW mode in an effort to preserve tyre life ahead of qualifying and the race, for which they must use the same set.
De Vries was the early pacesetter in the shorter 30-minute session, leading the way on 1m07.358s over points leader Antonio Felix da Costa as Dragon driver Nico Muller ran a strong third.
In an incident-free session, the leading trio remained unchallenged until the final 10 minutes when Nissan e.dams driver Sebastien Buemi improved with a 1m07.301.
Two minutes later, BMW Andretti’s Maximilian Gunther became the first person to switch into the higher power setting and found another three tenths across the final two sectors to eclipse Buemi.
For another five minutes the order would remain static before de Vries finally responded with his eventual benchmark of 1m06.922s.
Da Costa suffered a strange moment when he activated attack mode, as he missed the first part of the off-line gate to access the power boost and then briefly slowed on track to block NIO 333 driver Daniel Abt.
Despite this and myriad lock ups, the DS Techeetah driver ran just 0.076s shy of de Vries to end the run in second place – the only other driver to post a 1m06s effort.
Gunther would see the session out in third place ahead of an improved Mahindra Racing charge led by Jerome D’Ambrosio in fourth place.
Buemi slipped to an eventual fifth ahead of Jaguar lead driver Mitch Evans, who lies second in the points to da Costa.
Sam Bird was seventh, as he begins his Envision Virgin Racing swansong, despite making a couple of mistakes on his final flying lap.
Lucas di Grassi edged Audi team-mate and double DTM champion Rene Rast for eighth as Muller eventually completed the top 10.
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