battery keeps dieing

check for a draw on the battery with the key off, unhook the postive cable from the battery. use a multimeter hooked to the positive post on the battery and the negative multimeter lead hooked to the postive battery cable with the key off, set multimeter to the amps setting.
There should be less than a 10 mA draw on the battery DO NOT try to turn it over as you will fry the multimeter, if there is more of a current draw then 10 mA start pulling fuses until you find the one causing the problem. then its time to do so wire tracing. If you don't find the draw by pulling fuses check unfused items such as starter relay, alternator and other items like these that have power all the time. also check with the multimeter that the alternator is putting out more than 12.6 volts at all time if it isn't its not doing its job

hope this helps