In the Northeast, we have EZPass transponders in vehicles, to collect road tolls. I was looking for a good spot to install one on the new K1300GT, where it would not be easily stolen. I think I found the perfect spot; under the battery cover, in front of the gas filler cap.
Here are some pictures of the installation.
First, I removed the two screws from the battery cover.
To pop the cover, I slid my hand under the front of the cover and used my fingers to push up on the center of the underside of the cover.
Here's a picture of the underside of the cover and the battery compartment (red lead on the left and black on the right). There's plenty of clearance to velcro a transponder to the bottom of the cover.
Here is a picture of the EZPass transponder. Not that big, and thankfully only about an inch thick.
On the bottom of the tranponder, I attached a pad of velcro (the soft side, not the hook side).
I then stuck a piece of heavy duty velcro (hook side) on the pad. This is the side that will be stuck to the underside of the cover.
Now comes the tricky part. There is a ridge of black plastic (which you can see in the picture below) that the transponder must be behind. So, I used a shim (in this case a stud finder) on top of the battery, to elevate the transponder high enough that the exposed sticky side of the velcro will stick to the cover when I "install" it. I also used a shim (this was an extra piece of velcro) to position the transponder horizontally in right position.
I carefully reinserted the cover and pressed down on it to have the transponder stick to it in the proper location. I then removed the cover with the transponder stuck to it and pressed down on the transponder hard to seat it. The next two pictures show the measurements that resulted for proper transponder placement.
I then reinstalled the battery cover with the transponder nicely hidden underneath. Worst case scenario, if the transponder comes loose, it's a self contained plastic box, so it will have no ill-effects sitting on top of the battery.
Word of caution, if you drop anything during this process, it will disappear under the battery and into the bike internals. So be careful. Below is a picture of the battery tray with the battery removed. When I was removing the "shims" the piece of velcro slipped and disappeared, never to be seen again. It's plastic, so worst case it will melt somewhere, but I'll smell it long before it becomes a problem (hopefully).