I stopped in at my BMW dealer and checked on the part numbers of the voltage regulators used over the years on the R1150 GS.
The part number for the voltage regulator for a 2001 and 2003 GS model were the same.
So I would like to have BMW AG or BMW NA explain why all the black magic surrounding "their" special gel battery charger.
If the gel battery in my 2003 R1150 GS Adventure can be charged by the same charging system as a 2001 that employed a lead acid battery, what do I need a special BMW gel charger for?
As it stands now, they haven't proven their case, BMW Service Bulletin or not.