Good idea and info. I also broke my fob trying to replace the Panasonic battery, desoldered something...

Mind sharing where you are finding them that cheap? They seem to be just the shell no PCB, or at around $30 a piece on eBay....

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Mike - Greater Seattle, WA, USA
2002 E53 X5 4.4i Sport Pkg Black (daily & tow vehicle)
2003 E53 X5 4.6is Estoril Blue (to replace 4.4i soon)
2002 E53 X5 4.4i Sport Pkg Silver [sold]
2001 E46 325Ci Hardtop 5MT Topaz Blue [sold]
+ Toyota track/autox/rally cars: MR2 (x2), Celica AllTrac Turbo (x3)