thought I red it somewhere searching the forums here... anyways... here's an interesting thread on batteries and how to reprogram them...https://www.ferrarichat.com/forum/threads/inside-an-f355-fob.471869/#post-143609260 and https://www.ferrarichat.com/forum/threads/how-to-program-a-key-fob-and-start-car-w-o-fob.388139/