Anyone have similar experience can provide feedback to Model X key fob low battery issues? 1) How long in advance do "low key fob battery" message usually warn before fob battery completely runs out? Other non-Tesla cars, the warning could occur for several days and still work fine before fob battery need replacing. For my situation, I got the low battery warning at lunchtime, and by end of workday it was completely out. 2) For key fob battery to last less than 40 days from initial car pickup seems absolutely abnormal to me. What could contribute to such quick battery loss? I tested after, where I usually leave my keys at home, if I press on the key fob it is close enough to where my car is parked to lock/unlock the car. But not close enough that it will automatically unlock car without pushing button. Does being that distance still constantly use up key fob battery? 3) Is this something need to take to service to look in detail, or I should just buy and replace key fob battery myself? I tried removing key fob battery and putting same battery back in, but that didn't work so fob battery seems to be completely dead. *Recapping my situation in more detail: Picked up new Model X on December 19, 2016. I had a service appointment last Wednesday for unrelated issues, and there was no warning then of low battery on key fob. I do wonder though if something happened during service that significantly reduced my key fob battery. Two days later, during lunch hour on Friday, I got my first warning that the key fob is low on battery. When I return to car again 3-4 hours hours later, the key fob was completely out of battery and I couldn't get into car. Being at work, my key fob was not within range of my parking spot during those hours. Thankfully, when I called Tesla support, they were able to help me unlock car remotely and then I reactivated mobile access (got turned off during either service appointment or software update?) to be able to start engine via phone app.