I use the Hella Battery Cutoff switch. It is a key type, and it fits nicely in the battery compartment. I bought mine from Quadratec, which is a Jeep Outfitter, for around $20.00. I have had it for three years with no trouble. You can even buy spare keys for around $3.00. Quadratec's phone number is 1.800.745.5337. Jeff