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Dave Smith

Joined: 15 Nov 2006
Posts: 95
Location: Fleet

2004 Porsche 996 Targa

PostPosted: Wed Oct 04, 2017 10:55 am    Post subject: Battery Replacement Reply with quote

Just replaced my battery for the 3rd time in 9 years.

Last 2 were OEM ones fitted by Porsche as it was under warranty at the time. Each lasted just over 4 years before dying, despite being on a CTEK trickle charger throughout. First one died on the day it was delivered...

One thing I noticed when I checked the old battery was it had lost a large amount of acid (so plates were exposed and starting to warp). Not sure if the reconditioning mode of the CTEK had perhaps killed it.

This time I have gone for a Bosch S5 A11 (80Ah AGM) which I hope will last a bit longer.

I managed to get the old battery out and new one in whilst keeping power to the car by keeping the charger attached to the terminals (I had put the ignition key into first position as well).

The battery is a bit of a pig to get out due to weight and location and in case it helps anybody else the main lip holding it in is on the back (scuttle) edge - so you need to lift itup at the front to get it out.

Nice to work on the car for a change and actually fix it Smile
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Joined: 28 Feb 2011
Posts: 36
Location: Oulton Park

PostPosted: Wed Oct 04, 2017 11:58 am    Post subject: Reply with quote

Great tip re the retaining lip on the back. Swapped my battery out last weekend and couldn't believe how heavy it was (until I realised the retaining lip was holding it in place) Embarassed
2003 996 Turbo
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Albert Park

Joined: 04 Jun 2009
Posts: 1715

PostPosted: Wed Oct 04, 2017 12:10 pm    Post subject: Reply with quote

Bosch S5 is the best option for longevity and cranking power. Should serve you well.

As you say they're not the lightest. The positioning is good for weight distribution in the car, but not so good for the lower back. Wink
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Joined: 28 Dec 2012
Posts: 2548

1999 Porsche 996 Carrera 2

PostPosted: Wed Oct 04, 2017 12:48 pm    Post subject: Reply with quote

2 years ago I replaced my battery with a "power line" brand from tayna.co.uk, £42 next day delivered.

Has been perfect for 2 winters and over 10k miles so far. Car cranks and starts on the button in the depths of frosty mornings.... fingers crossed it lasts at least another winter.

No need for a CTEK, my car gets driven!

PS you should go and weigh in your old batteries, last time scrap was this high I got a tenner.
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Joined: 21 Mar 2015
Posts: 5014
Location: Brighton

PostPosted: Wed Oct 04, 2017 6:47 pm    Post subject: Reply with quote

Its a bit akward getting the battery out ..

Put some towels or car mat covers in the front boot then climb in , you can find a comfortable position then lift out the battery .. thats what i do .

Bosch batterys do need some " jiggleing " to fit in the tray ..

Original Porsche Moll batterys are er.. not very good shall we say .. the new red tops are far better .. but not cheap .

7pm - 9pm
At an Indy these days !
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Joined: 19 Apr 2017
Posts: 50

PostPosted: Sun Oct 08, 2017 4:03 pm    Post subject: Reply with quote

My car let me down on Friday Sad Just a flat battery though, so I'll forgive it. I fitted a new Bosch S5 yesterday, the largest that would fit. Change to clean the battery tray too.
Easy out and in by standing under the bonnet, as suggested .
I fitted a trickle charger tail while I was at it.

All good again now Smile

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