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Porschekit
Österreich


Joined: 12 Aug 2014
Posts: 971
Location: North East UK


PostPosted: Tue Jan 21, 2020 3:01 pm    Post subject: (another) Battery charging / CTEK question? Reply with quote

On a 997.1 C4S

My battery is a DYNAMIC, 12V, 110 Ah, CCA 850 (SAE)
It's been on the car for five and a half years since July 2014.

I keep it on trickle charge every winter using a CTEK 5.0 and it usually ramps up from a low light (3 or 4) to full power (7) overnight and then the "top up" light ( 8 ) comes on and off intermittently. Never had any problems.

It's been like that for a couple of weeks and with it mostly in the (7) position, but now the number 8 light is 'permanently' on (couple of days now), so I assume always drawing power trying to top up the battery.

Does this mean the battery has come to the end of its useful life, or is it a case of suck it and see when I fire her up??
Anyone got similar experience and how did your battery fare, did you have to renew?

Thanks all....
John.....Thumb
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997.1 C4S Meteor Grey Metalic
 
  
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chicb
Silverstone


Joined: 01 Jun 2017
Posts: 137



PostPosted: Tue Jan 21, 2020 3:43 pm    Post subject: Reply with quote

The first green light is when it is fully charged then the second green light is a pulse mode which starts the charge cycle when the voltage drops. My Porsche & F type basically live on the Cteks for months during the winter. I find that after the first green light comes on it takes about a week or two for the second green light to come on, then it stays on for the rest of the time the Cteks are connected. Cars always start first time. My cars are never locked so the alarms are not even taking any power
 
  
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Porschekit
Österreich


Joined: 12 Aug 2014
Posts: 971
Location: North East UK


PostPosted: Tue Jan 21, 2020 4:01 pm    Post subject: Reply with quote

Thanks chicb, I understand that the battery is full when it reaches the first green light (7) and I'd assumed that the second green light ( 8 ) only came on when it was drawing power to "top up" so to speak. I'd never known the second ( 8 ) light to stay on permanently.... any other thoughts folks ?
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997.1 C4S Meteor Grey Metalic
 
  
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jl-c
Spa-Francorchamps


Joined: 22 Jul 2013
Posts: 276
Location: Shropshire


PostPosted: Tue Jan 21, 2020 8:30 pm    Post subject: Reply with quote

I'd have thought it would make sense to buy or borrow a battery load tester and test it to get a definative answer rather than ask for guesses on here? I would expect to be replacing a battery that old, but you never know! And the CTek behaviour sounds perfectly normal to me.
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Porsche Carrera 2S 2005 black fully Hartech'd!, BMW Z4 coupé 2007 blue, Mazda Eunos 1996 yellow, VW Passat 2014 black.


We all do silly things/make mistakes, it's how we deal with them that sets us apart from animals and Americans.
 
  
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