Originally Posted by wardenross
Call the Battery Tender folks, they will explain how it works....
Yea, I know...it's a German thang!
The following is a message from the company president.
I will try to end the confusion about the new BMW Gel battery Battery
The BMW Gel Battery Tender is in fact different than the normal Battery
Tender Plus. Although the Deltran Battery Tender Plus and the BMW Battery
Tender appear the same they are quite different. Approximately one year ago
BMW contacted us concerning their new Gel battery that is manufactured by
Exide battery in Germany. We were instructed to redesign the charge
algorithm to comply specifically with the new Exide Gel battery. Exide
recommended very specific changes to the charge curve, one being a timed
sequence during the absorption period. Please keep in mind that our
engineering staff has been designing charge curves for over fourteen years
and prior to this design request had never seen anything quite like the new
As the old saying goes, "the customer always knows best," we can only
as requested. If BWM/Exide says charge it to their instructions and the
battery will last through the warranty period who are we to argue. If it is
any consolation, we have found it to be a very good battery and should give
you many years of service.
We do claim per our packaging that we correctly charge gel batteries,
prior to seeing the Exide battery that statement was true, we are now
changing our packaging to indicate otherwise. Due to the new battery design,
and to comply with the BMW warranty, the customer must purchase a "Gel
Specific" battery charger.
After all these years in the charger business we are still amazed how
every manufacture try's to re-invent the battery. We realize that with all
the different batteries in the market place the customer becomes very
confused and is usually forced to spend more money. Approximately three
years ago Harley-Davidson changed their battery design and manufacturer, it
proved to be a very wise decision and we can only hope it works out best for
BMW, and most importantly, you the customer.
Sorry for the Confusion,