2004 Cadillac Escalade Battery not holding charge

It is anyones guess what is draining it. It sounds like a rather large drain. Often times when extra amplifiers are installed, there is usually other items like a stereo, possibly an alarm system. When this stuff is tapped into circuits for power, and signals, it can be prone to keeping modules awake. All of the aftermarket items have to be disabled, before it can be determined that the vehicle itself, has a problem. Once the vehicle is back to original state, and the draw is being measured and determined excessive, then circuit fuses can start to be removed in an attempt to determine which circuit is causing a drain. Other than that, it is a crapshoot. It could be a bad battery, but this also can't be determined until the parasitic load is assessed.