Fernando Alonso explained his radio outburst at Ferrari during Q1 for the Brazilian Grand Prix was due to the car not being ready for a flying lap.

When Alonso took to the track for his first flying lap, he was overtaken in to Turn 1 by Pastor Maldonado and was seen gesturing in the car as he complained over the radio, saying: "Why I can't I start qualifying with the normal setting? How is it possible? How?"

Explaining the message after qualifying in eighth place, Alonso said it was due to the battery not being charged when he took to the track at the start of the session.

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"In Q1 we were not ready to do the laps," Alonso said. "The first flying lap is normally the best for the tyres and my first lap was a recharge lap because I had no battery coming out of the garage. So we were not prepared for Q1, let's say it like that.

"It didn't affect anything because Q1 is just a matter of going through. We put things in place and then we arrived in Q3 with the best performance on the car, one set of new soft tyres and we put the lap together at the last attempt, so it did not affect the qualifying. We just were not ready for that lap but it's no big thing.

"Obviously when it goes on television there is a big thing for tomorrow but there are hundreds of these things that don't go to television and it's normal."

With both Williams cars qualifying on the second row, Alonso feels it will be hard to move forward from eighth place and says Ferrari needs to focus on holding off McLaren in the constructors' championship.

"I think we need some help from the others to recover some positions. Maybe the rain can be one of these factors because it mixes things a little bit. It could be a DNF if you risk too much or it can be a good position, so we will see.

"As I said in Austin, at the moment the constructors' championship is my main priority. Maybe Williams is now too fast - we have to be realistic - so we have to defend from McLaren. As I did in Austin, finishing in front of both McLarens, tomorrow I will try to do the same."