£90 is the price for a genuine replacement part from Ducati.
Should be able to get one for about £55 ( GS ) at Italia Moto if it's not under warranty.
It's GT12-B4. The originals can be very short lived, Ducati now send different batteries out with the bikes that come with a acid pack, rather than being "ready to use!!"
As Henry say's check the main earth, it fastens on to the rear cylinder on the l/h side.Even if it seems tight loosen it and clean the contact area, if poss. give it a coat of vaseline or similar to stop corrosion, then retighten it.
[Edited on 26-11-2005 by SteveR]
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