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      03-13-2009, 12:45 AM   #1
yeefoo335
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Question How to disconnect battery on e90 335i?

This may sound stupid but is there a DIY on how to disconnect your battery? Do you just unscrew the negative battery terminal and thats it? What do you do exactly..

Posted this already but either people dont like me or just dont like to help..
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      03-13-2009, 01:50 PM   #2
Chase743
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Originally Posted by yeefoo335 View Post
This may sound stupid but is there a DIY on how to disconnect your battery? Do you just unscrew the negative battery terminal and thats it? What do you do exactly..

Posted this already but either people dont like me or just dont like to help..
Just disconnect the terminals. And be careful not to touch them together during the process.
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      03-15-2009, 08:35 PM   #3
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^ What he said.
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      03-16-2009, 08:03 AM   #4
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My dealer said the techs don't disconnect the cable from the battery. They disconnect at another location. They try to stay away from the battery terminals because the cables have a small charge embedded in them so to explode during an accident so there isn't a chance of an electrical fire. Just what he told me.
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      03-16-2009, 10:11 AM   #5
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Just disconnect the negative terminal by unscrewing the connecting bolt and remove it away from the battery terminal. It is very safe and won't creat spark with negative terminal.
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      03-16-2009, 11:08 AM   #6
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Originally Posted by darkcloud View Post
My dealer said the techs don't disconnect the cable from the battery. They disconnect at another location. They try to stay away from the battery terminals because the cables have a small charge embedded in them so to explode during an accident so there isn't a chance of an electrical fire. Just what he told me.
What they're talking about is the possibility of explosive gasses that can build up in the battery box while it's being charged. When you reconnect the wire there's always a current inrush that causes a spark, and it could ignite the gasses. It's one of those things that could happen, but in practice never really does. I wouldn't charge the battery with the cable disconnected and the trunk closed though, or at least let it air out for a while before hooking it back up.


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Just disconnect the negative terminal by unscrewing the connecting bolt and remove it away from the battery terminal. It is very safe and won't creat spark with negative terminal.
You'll get the same spark no matter which terminal you disconnect. The reason the negative terminal is the safer of the two is because if you bang the ratchet or wrench against something metal, there's no short circuit created. If you disconnect the + side first and do that, you're going to see what arc welding looks like up close.
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      04-04-2011, 05:29 PM   #7
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^what he said!
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