If you were worried about current draw draining the battery you could always fit a battery isolator switch, just means you'll have to set the clock and radio every time you turn it back on!!! Bad idea???

Other wise maybe get an auto elec to do a current draw test on your car and try to find a culprit for the battery drain? Maybe not due there hourly rates!! You could have a crack yourself, just buy a cheap Multimeter and start playing.