Battery problems of the 2002 Jeep Grand Cherokee

My 2002 jigs special edition w/ v8 4x4 has an unidentified electric problem. 3 times so far in 2005 when trying to start the Jeep the system goes completely dark. No electricity at all. It won't start, the lights won't work, the remote won't work. You can't even jump start it. The first time the dealer replaced the battery (even though I replaced it 8 months prior). The second time it started when the tow truck driver went to check the miles, so the dealer said there was no way for them to figure it out. Last night it happened again, again it has been towed to the dealer and I am waiting for results.

The cooling fan blade just broke while stopped at a light. It made the car thump I thought someone hit us but the fan blades broke the fan shrode and put dents all in the radiator and broke the fan guard. This vechile has had many of the same problems due to the electrical system. We lease the Jeep and have put $$$ in it because they would not take it back as a lemon with in the 2 years. I still hear a beep coming from under the dash that Jeep never found the problem or fixed it. I just had the fan relay changed because it went out. With in the first 2 years I had it in the shop for a variety of electrical problems I have all the paper work. I am afraid the Jeep will catch on fire or cause an accident. I've also checked many other things that were issues with the Jeep. Leaking shocks and transmission pan and emissions is now leaking. The check engine light stays on and every time I get it checked it's a different problem. I'm out of my warranty now but there have been so many different things wrong. The dealer replaced 2 of 4 leaking shocks they left the transmission pan loose when they replaced a part in the transmission. This Jeep is unsafe for the road it has lost power in the past while traveling so they replaced the battery twice with in a month.