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Car Battery Change

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I've had to buy a new battery for my 2015 Scout.  I've brought the correct AGM start stop battery but what I don't know is if you need to tell the car that it has a new battery via VCDS or onboard system.  Does anyone know?

 

cheers

With VCDS or OBDEleven, Gateway module (19), adaptations. Serial number should be changed by 1 digit - the default is likely to be 1111111111 if still on stock battery. Battery type should also be updated, as should the Ah capacity to suit the new one. There is an entry also for manufacturer which can be changed but probably the least important of the 4 parameters.

 

Not possible to do any of this via the infotainment system.

 

I'm surprised your 2015 needs a new battery, do you only ever do short trips? My 63 is still on its original.

Edited by ahenners

  • Author

So if I change today but don't get VCDS updated for a week is this going to cause an issue?

3 minutes ago, ScoutCJB said:

So if I change today but don't get VCDS updated for a week is this going to cause an issue?

 

In reality, no. It will just likely not take full advantage of the new battery and it's bigger capacity.

  • Author

Ok sorted ... they are very similar batteries although new one in a couple of amps bigger.

 

Anything else I may need to know or can I just swap them

Nope, just swap it over and you're all good. Dash might light up like an Xmas tree afterwards, but that should clear after a few mins of driving.

Had mine in for its first service last week. Just short of 12 months old. When I picked it up they told me they had changed the battery. Apparently there was a bad batch of batteries fitted and people were having problems with them,  so they were fitting new ones. 

Ideally use a good charger (I use a Ctek on power supply mode) while you swap batteries and it it is oblivious to the change, no messages

 

Tell it the new type (if you upgrade to AGM) new capacity and change the serial number(some people change 1 digit but for giggles I stick the correct number in there)

 

The world won't end if you don't but you may not get the best out of the new battery and may shorten its life if the car thinks it is charging a different type of battery.

  • Author

I swapped it out Sunday afternoon, battery was off for 8 mins approx and then I connected the new one.  Various lights on the dash (which I expected) and they all cleared once I got to the bottom of the road apart from the start stop error.  

Once i I had turned engine off and back on the start stop error cleared as well.

 

Everything else was fine, no loss of radio settings, time, Nav data or memory seat positions.

 

Appreciate people's input to the thread, I'll sort VCDS when I get it off my mate.

  • 4 weeks later...

Can I ask which battery did you buy?

Does it have to be AGM?

8 minutes ago, wyx087 said:

Can I ask which battery did you buy?

Does it have to be AGM?

 

Needs to be AGM or EFB with Stop/Start as they are designed to handle the increased number of starts. EFB will be slightly cheaper but you might as well go for AGM.

15 minutes ago, wyx087 said:

 

Factory fit in my 63 is EFB. I believe they would replace with another EFB.

 

Thought mine would have died by now but it's still going strong. I'd planned to replace with that exact Halfords AGM, it's a rebranded Yuasa. The Varta E39 AGM would be another option, or the Yuasa YBX9096.

7 hours ago, ahenners said:

The Varta E39 AGM would be another option

 

That is exactly what went on mine, got it HERE, difference from the old EFB is noticeable

7 hours ago, wyx087 said:

So forget about the Skoda one. EFB for more expensive than AGM is a very bad deal.

 

Halford fitted is just over £180.

 

But we have a winner in cost department, for AGM, inc fitting:

https://www.atseuromaster.co.uk/consumer/car-services/batteries/car-batteries/battery-096agm-3yr-760a-(sae)-uk-item-1000123398

 

It's the winner in straight up cost, but note the shorter 3 year warranty as opposed to Varta or Halfords offering 4. 

 

I'd check that the fitting includes coding as well to ensure the car is aware it has a new battery.

13 hours ago, flybynite said:

 

That is exactly what went on mine, got it HERE, difference from the old EFB is noticeable

£141 delivered here, best price so far, Thanks! £20 is worth getting my hands dirty.  How easy was it to physically get the battery out?

 

I only plan to drive this car for 3-4 more years, hopefully less depend on when I can go full electric. I also have doubts about battery warranty, it's a non-moving part with little to go wrong. Warranty can always argue it hasn't degraded enough for a new one.

On 23/12/2018 at 22:21, flybynite said:

Ideally use a good charger (I use a Ctek on power supply mode) while you swap batteries and it it is oblivious to the change, no messages

 

 

 

That's interesting. I wonder if any low-current charger via the 12V socket would achieve this or not.

 

 

Is the car smart enough to change how it treats the battery over its lifespan? or does it just go on its current voltage when deciding when to charge, when to stop stop/start, etc?

 

 

There are lies and half-truths about a number of the "smart" things (DSG "learning" for example - means the bite point, nothing else).

 

1 hour ago, Jono said:

That's interesting. I wonder if any low-current charger via the 12V socket would achieve this or not.

 

Never tried it but not sure it would work completely because you are supplying it downstream of the BCM. it will still see the loss upstream. Just like the errors people get when they take a power supply straight from the battery and get messages because it sees the 'drain' not accounted for through the BCM

 

2 hours ago, Jono said:

Is the car smart enough to change how it treats the battery over its lifespan? or does it just go on its current voltage when deciding when to charge, when to stop stop/start, etc?

 

The BCM is a pretty clever unit . It does not charge the battery when the car needs the power from the engine, only when there is more engine power than the car needs (overrun etc) It will not waste charging time on a battery that will take no more. (bad for emissions) It remembers this level and schedules the charging accordingly. it will not reset this until the battery is changed (and you have to tell it) The telling made more of a difference to the availability of stop start than the battery change did on its own when I ditched the old EFB

 

1 hour ago, Jono said:

(DSG "learning" for example - means the bite point, nothing else)

 

That is not what people mean by "learning" they mean the fact that it "adapts to your driving style". It still does not mean it remembers from one day, month/year to the next but it 'learns' how you drive on an instantaneous basis by how you use your throttle and changes gear accordingly.

 

"Adapt" is a better word than "learn" for it, but what it does is actually quite smart.

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