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Joined: 07 Oct 2013
Posts: 158

PostPosted: Tue Apr 18, 2017 12:06 pm    Post subject: Battery life Reply with quote

I drive my car every day during the week. Last week I shut the car off at 6pm Thursday. Got in this morning and on key position 2 the voltmeter was between 10 and 12. A momentary slow crank and then started fine.

Two questions:

1. What is the average battery life? I replaced it with a Bosch silver something in 2014.

2. When does it go into sleep mode - after 5 days?
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Joined: 07 Oct 2016
Posts: 759

PostPosted: Tue Apr 18, 2017 2:30 pm    Post subject: Reply with quote

I would expect a quality modern battery to last 10 years and yes, 5 days for the sleep mode.

2003 996.2 C2 Coupe Arctic Silver
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Joined: 21 Mar 2015
Posts: 4600
Location: Brighton

PostPosted: Tue Apr 18, 2017 6:23 pm    Post subject: Reply with quote

You would need to check the battery first but you may have an alternator thats not brilliant causeing a low output or even a discharge fault .

7pm - 9pm
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Joined: 03 Mar 2014
Posts: 823
Location: East Sussex

2008 Porsche 997 Carrera 2

PostPosted: Thu Apr 20, 2017 12:20 pm    Post subject: Reply with quote

Sometimes they don't last long at all.

My battery kept dying even thought the amp meter displayed a good output so I put a new battery on and all was fine for a couple of weeks then the alternator died, shorted and took out the new battery with it.

So I ended up with 2 x batteries in less than a month Dohhh!
According to Chris Craft, I'm officially the 'Unluckiest 911 owner in the world'.
My first 4 x 911’s all suffered catastrophic engine failures. Now on Porsche no. 8

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Joined: 17 May 2013
Posts: 1112

PostPosted: Thu Apr 20, 2017 12:26 pm    Post subject: Reply with quote

As its got a 4 year warranty, you could always email bosch and ask them, or before you do that i believe alot of garages have a device to test the capacity of batteries. I changed mine a few years ago and its such an easy job, i had to change my wifes focus battery (2012 plate original battery) and it was so awkward to change. That died last thursday and again this tuesday but shes on mat leave and has been doing lots of short journeys so i think its killed the battery and its not holding its charge.
Old:1999 Carrera 2 3.4 in ocean blue with a savanna interior.
New:2002 Turbo in silver with black interior - the smile machine
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