![BMW E90 3 Series Battery Replacement With Registration & Coding. Switch From 90 AH to 80 AH - YouTube BMW E90 3 Series Battery Replacement With Registration & Coding. Switch From 90 AH to 80 AH - YouTube](https://i.ytimg.com/vi/6ur-itzUyvo/maxresdefault.jpg)
BMW E90 3 Series Battery Replacement With Registration & Coding. Switch From 90 AH to 80 AH - YouTube
![Battery Help, what's the purpose of this grey hose? Need to change the battery but the only one locally available in this size has no port for this hose to be attached. Battery Help, what's the purpose of this grey hose? Need to change the battery but the only one locally available in this size has no port for this hose to be attached.](https://preview.redd.it/vl6j58yg04571.jpg?width=640&crop=smart&auto=webp&s=9a6c329a839f58ae214c97a60dcf174b456829e8)
Battery Help, what's the purpose of this grey hose? Need to change the battery but the only one locally available in this size has no port for this hose to be attached.
![Just replaced my battery on a 2010 E90. Does it need reprogramming? Not sure it has the power management system? : r/BmwTech Just replaced my battery on a 2010 E90. Does it need reprogramming? Not sure it has the power management system? : r/BmwTech](https://i.redd.it/lu3uozrivxn71.jpg)