When i bought the car one was already replaced, and the other was probably a Sanyo if it's oem. But it was very much out of shape (not working further than 2m distance) even after long drive to charge it.
So now i have no choice than using those crappy yellow batteries you find on ebay, at least with practice it takes me like 5min to change it.

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E53 - 2005 3.0dA