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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I can tell you that with my Cayenne keyfob, that the battery has to have higher than normal voltage when the contact has green corrosion. :-/
I've been meaning to write this up for the Cayenne forum, but in short, the contact that grabs the side of the battery is not soldered to the board. (it's a spring contact) This (with a little moisture) allows the contact pad, on the PCB (printed circuit board) to corrode, and add resistance to the path. Then batteries seem to toast quickly. But really, it's this bad contact that is casing problems.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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