If you have put valve covers on you celica please double check its distance to the battery.
I got into my car this afternoon and went to leave for lunch and the car COMPLETELY died. The valve cover had sliced through the battery wire! None the less it was towed and now I have no car
Also if you have a strut bar, check that as well. If the bar is to close and you hit a bump it could connect with the battery and cause you to blow a fuse.