pilotpete2, thanks for the offer but I have 2 of them.. I looked at it and ist not part of the charging system. its at the end of the nicads. I googled the data on the silver thing (klixon 3-s 4mm75a) , I believe its a thermal switch.
http://www.sselec.com/data/parts%20s...emostats-2.pdf.
anybody else have any info why its used?