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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-09-2012, 07:46 PM   #1
KOpower
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The longest your battery can go without starting her

Sometimes my car doesn't get a lot of action and was wonder what other e46 owners experience was in starting her up after a long period of time.

I had an old battery in my car - which eventually died - and of I didn't start it up every week I would have problems

My new battery is super cool - I started her up after 3.5 weeks (came back from holiday) - and she started up just fine

The person who sold me the battery said the battery has a 'shelf life' of 2 years or something and if I didn't startup my car for months it would still work fine

I am not sure about that. Anyone else's experience? does the BMW drain the battery if u leave it sitting?

I have friend who has a car he hardly uses who takes out the terminal every time he uses the car - cant really do that on the e46 - as the battery is hard to get to - and I dont think thats reccomended unless your car is in storage for a good long few months/year?
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Old 09-09-2012, 08:33 PM   #2
Stinger9
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All modern cars have an idle current when the car sits, measured in miliamperes. Your battery will run down over time depending upon the quality of the battery and your individual car.

I keep a current Autozone 49DL in my car and it sits in my garage for months at a time and with the factory alarm powered up.

After about six weeks my car will still start fine. But at that point I notice the first turnover is not as brisk as if the car is used constantly.

Probably would not have a problem making it to the two month point.
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Old 09-09-2012, 08:44 PM   #3
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Forgot to disconnect my terminals @ one point in time while I went away for over 4 months. Started up just fine on the first try as if i never left
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Old 09-09-2012, 08:55 PM   #4
KOpower
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Quote:
Originally Posted by JEFFEFECKS View Post
Forgot to disconnect my terminals @ one point in time while I went away for over 4 months. Started up just fine on the first try as if i never left
Wow 4 months ! That's a lot!!
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Old 09-09-2012, 08:57 PM   #5
KOpower
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Originally Posted by Stinger9 View Post

After about six weeks my car will still start fine. But at that point I notice the first turnover is not as brisk as if the car is used constantly.

Probably would not have a problem making it to the two month point.
Those stats aren't too bad either - what are others experiences with the e46?
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Old 09-09-2012, 09:27 PM   #6
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Make sure you factor in your alarm if you have one and leave it on.
Could be a meaningful % of the resting current draw.
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Old 09-10-2012, 02:28 AM   #7
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Might be worth getting a higher capacity battery or a deep cycle battery if you frequently have extended periods without starting the car. I think the longest mine has gone is a month or so, and there were no issues. Engine maybe wasn't as smooth as typical, but that very well could have been the gas or lack of oil
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