Ford Car Key Battery. Don't Spend a Fortune At The Dealership. If your car key remote works after replacing the battery, then you're done.
Attempting to do this on your own may cause you to damage the key fob, which will cost you even more money to fix. Press button on the key fob to release and flip out the key. Some key fobs will snap apart, while others will have a screw that will need to be taken out.
Different fobs were used for different models.
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Remove and replace the battery ensuring that insert the battery with the correct polarity. I tried the method described here and it worked beautifully! If your key does not work after changing the key fob battery, here are some possible causes.