Lately my key fob has been chewing through batteries every 2-3 days. I put fresh ones in it and 3 days later 1 will be totally dead. I rarely use the remote alot, its on a lanyard so its not like im accidentally pushing buttons all the time.

I have no idea where to start on this one

 

Any moisture inside the fob?

Maybe one of the buttons is constantly on.

While looking into the red lens on the fob press and hold on of the buttons for 5 secs. The light should blink twice faintly then once brightly.
Now do the other button. Should do the same thing.
If you get two brite flashes while pressing any one button, then the other button is somehow stuck.

I think... (no really!)

 

I thought that at first, so i took it apart and cleaned it, no moisture.
I only get one flash each button

 

This could be the problem.