I was wrong. It's a lot cheaper. Only $200 for the 105 Amp. This is what BMW replace your battery with to solve the shitty battery problems everyone had.
BMW Genuine Factory Part
Fits 2014 BMW 550i xDrive Base
Part Number: 61217648317
Battery W/O HYBRID, CONVENTIONAL, 105 amp
Item #1 on image
MSRP
$254.62 Save
$50.92 Online Price
$203.70
http://www.trademotion.com/parts/201...&siteid=214697