Quote:
Originally Posted by andrewwynn
More often than not the " battery died " is actually just cold solder joints . I've done Reflow on a couple keys to make them work again otherwise the buttons also will break and that will cause malfunction. If you can open up the key check the voltage. Also did you replace the battery with an appropriate 3 volt rechargeable lithium battery
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Yep, almost every non-func FOB I've opened had a broken battery solder joint from years of being dropped and handled... well, like a key.
Not sure the brain surgery analogy holds up... but yes, if you are completely ham-fisted or very impatient, don't attempt to replace one of these batteries.