How does the Weibull distribution work as fault model in wireless sensor networks?
Step 1: Fit a Weibull distribution to all transmitter circuit faults (with one set of parameters).  Fit a Weibull to battery condition faults (with another set of parameters).  You get five different Weibull distributions.

Step 2: During simulation, randomly draw one number from each of the Weibull distributions.  This gives you the time until the first transmitter circuit fault, the time until the first battery condition fault, and so on.  Pick the smallest number; that's the fault that occurs first.  Simulate a fault of that type, at that time.  (You can continue the simulation to simulate multiple faults if you want.)