Hi, I've just bought a Fiesta Eco Boost, with the Auto start stop feature. All of my mileage is driven around the town, and so far the Auto stop is kicking in every few minutes (I go through 7 sets of traffic lights, and tow roundabouts on my journey to work which is only 2 1/2 miles). I am wondering what affect this will have on my car battery. In my previous Fiestas (of which I've had 14), none of these had that feature, but especially during the dark nights I would purposely have to go for a run out to give the battery a bit of a charge, if I didn't I would sometimes have trouble starting the car in the morning. I am wondering if in my case it would be better to override the auto stop (switching it off). I know that's not the idea Ford had in mind, but my car isn't getting to do any "normal" driving. I've also noticed that when I'm driving the car it feels as if the choke is out and the car is sounding/feeling like it's going to stall (the engine isn't running smooth). Is this because of the Auto Start Stop feature. I've only ever experienced this sort of thing when the weather is really cold and the engine has only just been running a couple of minutes. At the moment the weather isn't that cold (60 Fahrenheit).

Any help or advice would be appreciated.

Thanks

If the battery level gets too low start stop won't work and it'll keep the engine running. You should have no reason to manually override it.

Yeah mate no need to worry the car has two batteries and like said if power gets too low auto stop will stop working.

Cold engine is probably the only reason that's happening mate try putting some premium fuel and see if that helps to boost it a bit in the cold

Didn't realise it had two batteries, I just thought it was one much larger one.

Only one battery in the Fiesta Ecoboost - it is huge though.

I try to second guess traffic lights and only let it stop if I think I'll be there for a little while. Also not being first in the queue is a bonus for reaction times. If I think I'll only be there 3 or 4 secs then I don't let it stop.

Hi thanks for all the comments, I feel a bit reassured about the battery now though. I tried driving this morning with the Auto Start Stop switched off out of curiosity, the engine is running a lot smoother with it switched off, it doesn't feel like it's going to stall. The car drives a lot better.