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      04-26-2010, 05:11 PM   #7
GenePoole
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Drives: '06 E90 330i
Join Date: Apr 2010
Location: Brighton, IL

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First of all, Disclaimer: try at your own risk!

I was looking at my "expendable" (and expended) FOB and it looks like there is no glue at the corner where the key ring would loop through:



So if I were to attempt to separate the FOB, I'd try to wedge something into the groove in that area. Like this:



Once wedged in, a small screw driver blade should be adequate to separate the two halves.

The battery is a Panasonic VL2020, but I don't know about general availability. I doubt that the tabs would line-up correctly anyway. Your best bet is probably ebay. This gives you one to practice on.

With the board removed, unsolder the battery here:



and here:



Once the good battery is resoldered into the good board, glue the two halves of the FOB shell back together with a suitable glue. I recommend Gorilla Super Glue because it is a light gel and will fill voids better than a traditional cyanoacrylate (crazy-glue). You could probably use ABS or PVC cement too, but they could get messy.