Originally Posted by cn555ic
Cheapest way is buy the Oem battery and then install it yourself and then come to me so I can code it for you.
Buy the OEM battery and if you have a K+DCAN cable download software from this site and run it on a laptop.<<http://bimmersoftware.com/BMWLogger-2>> You must replace it with a battery with the same specs for the registering to work properly. If a different battery is installed more sopisicated coding is required by cn555ic. Registering worked for my 335. BTW - Registering was a breeze compared to getting the new battery in that cubby hole.