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Old 11-14-2014, 03:46 AM
Carrera1 Carrera1 is offline
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Location: South Wales
Join Date: Nov 2014
Posts: 1
Mein Auto: 1Series
Battery draining overnight??

I'm new to the forum, I would like to begin by stating something positive, but regrettably I've had to join since I've had nothing but troubles with my 1series for the last three years, and sharing my experiences and problems may avoid fellow 1series drivers costly repairs in the future.

My latest issue I believe is with the battery. Unable to start after a series of short journeys, and last night I turned the headlights on and the horn began to sound.

I've had the battery checked and voltage appears fine, alternator also working OK, but something seems to be draining the battery overnight. (Yes, I've made sure everything I have control over is off).

I'm convinced it's the battery since I believe the original battery is still in the car, therefore approaching 7 years old, but I don't want to spend 180ish on new battery only to find it is something else.

Any thoughts or advice would be gratefully received.

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Old 11-14-2014, 07:37 AM
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tim330i tim330i is offline
Location: Boston
Join Date: Dec 2001
Posts: 6,444
Mein Auto: Ti Silver 03 M3
Welcome to Bimmerfest! I've moved your question over to the general BMW forum, you will get more help in here. There are videos on youtube about finding a parasitic drain on your battery, you could start there. Do you have any aftermarket electronics installed? When did this start happen? What changes happened before this started happening. Did it get colder, did you do any maintenance, etc.
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Old 11-14-2014, 08:31 AM
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need4speed need4speed is offline
Officially Welcomed to the 'Fest
Location: South Carolina
Join Date: May 2006
Posts: 2,670
Mein Auto: 09 335Cabrio zsp/11 335d
Modern BMW's are battery vampires (to quote NK) it would not surprise me at all if it was the battery. Time to replace it is my guess. N4S
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