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casual wwe fan number 24,713: Vergne is clearly the class act of the field. Quality driver at this level
Craig Humphreys: With all the shade being thrown at Ma Qinghua, he will never have a problem with battery temp management.
He's been shown the blue flags and has been lapped.
"You have another chance."
Jack Nicholls
BBC Radio 5 Live F1 commentator
Max Gunther has a stab at Jean-Eric Vergne for second place, and they almost collide.
"Some dodgy defending from Vergne" says Jack.
Around 9% battery remaining for most of the drivers now. Mitch Evans has taken fastest lap and he's now up to eighth. Unlikely to make the podium but that's not a bad drive from P24.
Four mins +1 lap remaining
Vergne is 3.2 sec behind Da Costa, but Gunther is closing in on JEV only 0.3 sec behind.
Lotterer and Sebastien Buemi have their own battle 0.3 sec apart but 4.7 behind the battle between the top three.
Championship winners DS Techeetah now have a one-two as Jean-Eric Vergne gets up to second behind Da Costa.
Andre Lotterer makes a smooth overtake with his remaining attack mode on Edoardo Mortara for fourth.
Meanwhile Lucas Di Grassi and Oliver Rowland had a battle for eighth but Di Grassi couldn't quite make it.
Gunther is 0.7 sec behind Da Costa, while Vergne is trailing in third 3.6 seconds behind.
The average remaining battery life is 34% currently, so energy management for the final 13 minutes + 1 lap is critical.
And that attack mode takes him back to the race lead, Da Costa also has the extra 25kw from Fanboost. But Gunther drives through the attack mode chevrons, there will be some cat and mouse here.
15 mins + 1 lap to go.
Antonio Felix Da Costa has taken his first batch of attack mode. He's first of the top eight drivers to take it.
"Everyone getting closer should we stay here?
"1.6 seconds behind Antonio."
"He's trying to save behind me - tell me what do I do."
Engineer: "Look forward."
Save energy, Max.
BMW's Max Gunther takes the lead!
He trailed Da Costa through the narrow corners, but pulled away down the start finish straight.
Mercedes' De Vries has taken his drive through penalty and is down in 20th. Meanwhile Mitch Evans is up to P15.
Jean-Eric Vergne is up to P4 from starting P11. The two-time Formula E champion has missed out on some practice running this weekend after being unwell. But he's attacking the leaders nicely.
Jack Nicholls
BBC Radio 5 Live F1 commentator
"Good job mate eyes forward, maximum efficiency."
Or as Jack Nicholls just translated, "eyes forward" means "don't get cocky, kid."
Pascal Wehrlein just made a lunge on Brendon Hartley to take his 13th place, but they're a good 11 seconds behind the race leaders.