I have one in the X5. 3 year warranty which is pretty good. If anyone knows of a longer warranty please post.

The other thing to consider is how long it's been sitting on the shelf. Certain stores have batteries but don't move a lot of them so you're buying an older one.

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'05 E53 3.0 6mt
'17 F30 340ix 6mt
'96 E36 328is, in progress