why am I losing battery power as it sits

Hello, There are various components on the vehicle that use keep alive memory, and this will slowly drain a battery over an extended period of non-use. However, you will need to conduct a parasitic draw test to determine how much amperage is being pulled from the battery while the vehicle is off. There are several methods, so look around the internet to find a method you are comfortable with. Also, you could use a test light on all of your individual fuses to determine which ones are getting power while the ignition is off, and determine if they should be getting powered or not. This can be a simple procedure, or very lengthy and tedious. Finally, you may just have a weak and failing battery, so don't hesitate to have it tested by a local parts store. A typical battery lasts about 3-5 years.