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emohawk11
Newbie


Joined: 01 Aug 2018
Posts: 25



PostPosted: Tue Jan 01, 2019 10:13 pm    Post subject: Battery condition issue ? Reply with quote

The last month or so the car has shown a couple of battery socket deactivation messages, and a battery low message. The car has been on the occasionally long run of a couple of 1-2hrs, with lots of very short runs in between. Car always cranks and starts ok though.

The battery voltage is reading 11.6V (with the engine switched OFF), which suggests the battery is poor? Do I need to look at a new AGM type battery replacement, and if so, should I get the Porsche one (I don’t have extended warranty), or an Eduraline battery for example from Tanya batteries ?

Thanks
 
  
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Magic919
Suzuka


Joined: 05 Jun 2013
Posts: 1008
Location: Berkshire


PostPosted: Wed Jan 02, 2019 8:56 am    Post subject: Reply with quote

I’d probably try giving it a good charge. I tend to avoid Porsche batteries.

I presume you mean Tayna and I expect they are fine.
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997.2 C4S PDK
 
  
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emohawk11
Newbie


Joined: 01 Aug 2018
Posts: 25



PostPosted: Wed Jan 02, 2019 9:05 am    Post subject: Reply with quote

Thanks for the reply, and sorry yes I did mean Tayna.

I have a trickle charger that I could use on the battery to give it a full charge. Is there any other way I can check the condition of the battery to determine it's health ?
 
  
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Magic919
Suzuka


Joined: 05 Jun 2013
Posts: 1008
Location: Berkshire


PostPosted: Wed Jan 02, 2019 10:01 am    Post subject: Reply with quote

From the 991, the car has a BMS (battery management system) from what I understand. I expect the warnings it gives are valid. I have another make of car with this and the dealer said the battery was low and needed a charge overnight.

Places like Kwik Fit have testing equipment.
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Magic919
Suzuka


Joined: 05 Jun 2013
Posts: 1008
Location: Berkshire


PostPosted: Wed Jan 02, 2019 10:04 am    Post subject: Reply with quote

Just a thought, it might needed coding to the car. Would be worth checking.
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emohawk11
Newbie


Joined: 01 Aug 2018
Posts: 25



PostPosted: Wed Jan 02, 2019 11:28 am    Post subject: Reply with quote

I read somewhere the battery didn't need coding to the ECU, but others on here probably know far better than me Smile
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6147
Location: Brighton


PostPosted: Wed Jan 02, 2019 6:47 pm    Post subject: Reply with quote

I would start by giving the battery a good charge with a trickle charger.

The voltage is low but it might just be the short journeys and a charge will get it back up to voltage .

Dont connect the charger direct to the battery terminal .. use the positive battery terminal and the post on the o/s.

You havent mentioned a flat battery and normally with a dead cell (knackered battery )you will get this.

You DO have to code a new battery onto a car .. although to be fair most things will work ok if you dont , you may well get stop start issues if you dont though.

You Dont have to fit a Porsche battery .. you just need to tell the car (via coding ) what type / size battery you are fitting .
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emohawk11
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Joined: 01 Aug 2018
Posts: 25



PostPosted: Wed Jan 02, 2019 8:48 pm    Post subject: Reply with quote

Thanks for the coding info & battery terminal trickle charge connection point recomendation. What's the issue with connecting the trickle charger to the battery ? just curious.

I work in IT, but I've no idea what equipment or software (or cost) I'd need to code the battery to the ECU. Any ideas on that one ?
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6147
Location: Brighton


PostPosted: Wed Jan 02, 2019 9:03 pm    Post subject: Reply with quote

If you charge the battery on the terminals it by passes the battery management system .. in other words it doesnt know the state of charge in the battery .

Without this info it can treat the battery as a low charge .. it will try and give a higher alternator output to charge it more .. it can think the battery is a lower charge than it is so shut down things like stop start etc .

i dont know the basic testers that can do this im afraid .. i use Auto logic or Piwis .. the theroy is .. if halfords say they can change the battery then they should have the tester to code it .. you need to ask im afraid .

It can just be replaced .. but you may or may not have issues with certain items so codeing a new one on is the best way forward .

Indys will do this as part of replaceing a battery .. or at least they should do .. we do .
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emohawk11
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PostPosted: Wed Jan 02, 2019 9:22 pm    Post subject: Reply with quote

Ok thank you. Stop start hasn't activated in about ~3 months so no need to disable it manually!
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6147
Location: Brighton


PostPosted: Thu Jan 03, 2019 7:35 pm    Post subject: Reply with quote

emohawk11 wrote:
Ok thank you. Stop start hasn't activated in about ~3 months so no need to disable it manually!


Thats because the battery lvl is low .. it wont activate if the charge state is below 80%.


The Auto Start Stop function is not available in the
following situations, for example:
• When Sport mode is activated.
• When PSM is switched off.
• During manoeuvring.
• When AC MAX mode is activated.
• When the “Windshield defrost” function is active.
• At elevations above approx. 9850 ft (3,000 meters).
• After engaging a gear without pressing the clutch pedal
when the engine is automatically stopped.


The Auto Start Stop function is available with limited
functionality in the following situations, for example:
• If the air conditioning or passenger compartment
heating is operated at a high setting or if the defrost
function is running for long periods of time.
• If the charge state of the battery is low...................... *******
• On uphill or downhill gradients.
• When vehicle internal test processes are taking place,
for example automatic engine diagnosis.
• In the case of excessively low exterior or battery
temperature.
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