What's the 2015 BMW 428i battery location?

Your 2015 BMW 428i battery is located in the trunk, on the passenger side, underneath a cover. While there are jumper terminals in the engine bay, that's the only electrical power You'll see there: BMW moved it all to the back for weight distribution. If You're replacing the battery, You're going to want a group size of 49, and probably around 900 cold crank amps. The Duralast Platinum AGM Battery H8-AGM is a good choice, for its performance and longevity (we put this one in our 428i) and can usually be had for just under $200.