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Replacing 987.1 Battery with CTEK connected to cig lighter socket?

JMR

JMR

PCGB Member
Member
I’ve read loads of threads each giving differing opinions on how to and what battery.


Boxster battery is ready to be replaced, the CTEK will charge it just enough to start the car, only just, any more starts and I have to hook up the NOCO Boost jumper to the battery.


Bought replacement battery from Eurocarparts.


Battery that has been in place since I bought the car 5.5 yr ago is a
Bosch S5 008 77Ah/ 780A
Dims: 278 x 175 x 190

So that’s what I’ve gone for again this time.


Some people on here I’ve seen recommend leaving the CTEK plugged in to the cig lighter socket so the car doesn’t lose clock/fuel trims/PSM settings/ radio code etc

Is it as simple as that?
Just remove negative terminal on battery, then positive, then battery clamp and refit in reverse?


Or are there any other precautions needed?

 
Minimise the load on the CTEk with the battery disconnected.

Car can also go into a factory ship state and need recoded by an OPC. My heated seats stopped working too. Maintaining voltage is the way round this.

 
Motorhead said:
I think that’s about right James. I’m not sure that it’s necessary on the 987 but you may want to put the key in the ignition to avoid the possibility of triggering the alarm.

This link may be of interest too:

https://www.porscheclubgb.com/forum/tm.aspx?m=770011

Jeff
Click to expand...

Thanks Jeff I read that thread this morning [:D]

So keep the CTEK plugged in to the cig lighter and disconnect the battery as normal?

Maybe leave the key in the ignition to stop the alarm going off.

I guess if the CTEKs still plugged in the alarm won't go off anyway because it won't lose charge ???

Thanks for the reply [8D]

 
Chappelle said:
Minimise the load on the CTEk with the battery disconnected.

Car can also go into a factory ship state and need recoded by an OPC. My heated seats stopped working too. Maintaining voltage is the way round this.
Click to expand...

Thanks for the reply Richard.

Minimise the load on the CTEK with the battery disconnected

What do you mean by this?

(I don't want to sound thick sorry :ROFLMAO:)

I'll literally leave the CTEK plugged in and disconnect the battery.

Sound ok ?

 
James,

I think Richard was just meaning make sure that everything electrical is switched off … lights, fan, radio, etc. Makes sense really.

Jeff

 
Motorhead said:
James,

I think Richard was just meaning make sure that everything electrical is switched off … lights, fan, radio, etc. Makes sense really.

Jeff
Click to expand...
Yes just that Jeff. Everything off where possible, fan, lights inc courtesy light, radio, Home on headlights etc

 
Thanks Jeff and Richard for your input [:)]

I've removed and refitted the battery and here's how it went.

Left the CTEK connected to the cig lighter.

CTEK said battery was fully charged this morning but when I went back to it to fit the new battery the red indicator was on, so I think again the CTEK had encountered a fault whilst charging.

The battery certainly has a problem and is about 6/7 years old.

The car still had power to unlock and lock and the lights came on.

Got round to removing the battery. First loosened the negative terminal with 10mm socket.

Removed the negative cable and wrapped a microfibre towel round it to stop it from touching any other metal part of the bodywork.

As soon as I did that, the interior light in the bonnet went out. So the CTEK was supplying zero power.

Anyway, on we went. :rolleyes:

Loosened positive terminal with 10mm socket and removed cable and wrapped in microfibre towel and set aside.

Removed the battery vent hose from the right hand side.

Removed battery base clamp bolt with 13mm socket.

Lifted battery out (I'm pleased I didn't go for the heavier, larger, higher capacity battery!! :ROFLMAO:)

Fitted new battery (exactly the same type and make) in reverse to above.

No alarms went off or anything.

Sat inside car, clock was still correct, trip meter was still correct, MPG had zero'd.

PCM turned straight on - no loss of service or radio codes required.

PSM Failure light came on dash with red exclamation.

Turned the key and the engine burst into life - no hesitation. Problem sorted.

Reversed out the garage and took the car a 10min spin round the block and that reset the PSM light.

Got back and had to re-learn the limits for open/close for the auto windows.

They now work again correctly.

Tidied all the bonnet storage and battery covers back up and we are back in business [8D]

And Richard I did check that the heated seats worked putting the car away seeing as you mentioned it earlier. [;)]
IMG_6190.HEIC


Pic attached of the old battery in situ before removal.

 
Good to hear that it all worked out well James … result!

Odd that it appeared that the CTEK wasn’t supplying sufficient power for the bonnet lamp but since most things held-up maybe it was actually providing some power? Maybe it was a function of using the cigarette lighter socket rather than connecting to the battery connectors directly?

Anyway, you’re good to go for another 5-years or more, but thanks for the feedback.

Jeff

 
Motorhead said:
Good to hear that it all worked out well James … result!

Odd that it appeared that the CTEK wasn’t supplying sufficient power for the bonnet lamp but since most things held-up maybe it was actually providing some power? Maybe it was a function of using the cigarette lighter socket rather than connecting to the battery connectors directly?

Anyway, you’re good to go for another 5-years or more, but thanks for the feedback.

Jeff
Click to expand...

Yes I think because the battery was at fault the CTEK stopped charging, so I should have unplugged it and set it charging again.

Or connected it to the -ve and +ve battery cables before removing the battery.

Wasn't too much hassle, just didn't want to electrocute myself haha or have to take it to the garage to pay to get stuff reset.

I was pretty happy that everything went nicely.

 
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