Battery Low Power warning Light

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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Nanu
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Battery Low Power warning Light

Post by Nanu » Sat Feb 09, 2019 8:51 pm

Perhaps it's just the time of year that we have lights, heating , radio all on when we drive and link that with short journeys and it may explain the warning light showing when I tried to programme the Sat Nav with the engine not running.

Is there any way I can check using the cars idrive the level battery charge or if the alternator is actually charging the battery? Don't want to buy a new battery if I don't need one?
Cant find any obvious way of checking.
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Battery Low Power warning Light

Post by metal licker » Sat Feb 09, 2019 8:55 pm

Take it out for a good blast tomorrow that'll sort it out :D
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Battery Low Power warning Light

Post by del_tl1000r » Sun Feb 10, 2019 10:44 pm

If you check across the battery terminals with a multimeter with the car running I think it should read around the 13.5v region if the alternator is charging ok.
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Battery Low Power warning Light

Post by obewan » Sun Feb 10, 2019 11:03 pm

From recent experience and previous threads, I believe at rest if the battery is less than 11.6 volts it is time to replace
As above, test with a multimeter across the terminals
I was also getting other warning lights, mostly the service light
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Battery Low Power warning Light

Post by Nanu » Mon Feb 11, 2019 8:26 pm

Thanks guys,

Now to find a neighbour with a multimeter as even as a novice in these technical matters, don't suppose two wet fingers will suffice :oops:
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Battery Low Power warning Light

Post by Mr Tidy » Tue Feb 12, 2019 12:03 am

Nanu wrote:
Mon Feb 11, 2019 8:26 pm
Now to find a neighbour with a multimeter as even as a novice in these technical matters, don't suppose two wet fingers will suffice
Wet fingers probably isn't the best option - but if you can't find a helpful neighbour you could always buy a cheap one from Toolstation or Screwfix for about a tenner! :thumbsup:
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Battery Low Power warning Light

Post by Silverzedtom » Tue Feb 12, 2019 12:47 am

Nanu wrote:
Mon Feb 11, 2019 8:26 pm
Thanks guys,

Now to find a neighbour with a multimeter as even as a novice in these technical matters, don't suppose two wet fingers will suffice :oops:
spend £20 and get the ‘Regin XE40’ multi meter. Does everything you’ll need in the car and around the house. I use mine every day at work and it’s never let me down
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Battery Low Power warning Light

Post by Nanu » Tue Feb 12, 2019 8:30 pm

Thanks for the recommendations, should come in handy as about to install some low voltage garden lights.
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