I have a charging mount on the panel hard wired to the plane. Keeps it fully charged and you can program it to start tracking as soon as it fires up...
Crappy morning so Google was my friend. One note I found said the Alkaline batteries would provide a warning with decrease performance vs the Lithium...
What the others have said. Cut on the inside of the square cover support/Make a square cover/don't go crazy with extra large or lots of screws/paint...
Price and right decision on what to do is all over the board. I had a call to go check on a Pacer that was landed on a cub strip, went of the end of...