Do you have both original keys? I wonder if they both have a problem at the same time. That would be one way to determine if it was a battery failure. Never been on f150online but you definitely found a great forum here. I am sure someone else with more experience with remote problems will chime in.

Welcome to the board and congrats on your new ride. Post some pics before and after your mods!

Cheers

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2008 ///M5 - Black Sapphire Metallic/Black Perforated Merino/Madeiro Walnut trim/6-spd Manual
2005 X5 4.8is - LeMans Blue/Black Nappa/Anthracite trim | born 05/20/05 - For Sale
2003 ///M5 - LeMans Blue/Black Interior/Aluminum trim/6-spd Manual - retired
2002 525i - Jet Black/Black Sport/5-spd Manual - retired
2002 X5 3.0i - Sterling Gray Metallic/Tan Leather Sport/5-spd Manual - retired