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WESTCO batteries are like the Energizer Bunnie ...
They just keep going and going and ... going.
My original factory-installed glass-mat battery failed within months of new bike purchase. BMW replaced it under warranty, and the dealer wisely installed a standard BMW sealed battery rather than another of BMW's troublesome glass-mat batteries.
Fred
I had a failure on my F800ST at about 7K and another at about 20K.
If the battery is performing fine, there is no need to change it. Batteries give warning when they are approaching end of life. QUOTE]
Not all batteries give warning prior to failure. There have been a number of exide OEM batteries in f800 ST and S that have experienced Sudden Death Battery Syndrome SDBS. My battery on an '09 F 800 ST was less than a year old, less than 10,000 miles, always hooked up to a trickle charger and one day just did not start. There were absolutley NO warning signs. If you do a search of the F 800 forums you will see a lot of folks that have have similar experiences. My battery was replaced under warrantee by BMW.