i have an 89 camry that has a couple of problems. 1. some sort of short that will drain the battery in 4-5 days of not running. 2. car started and was running fine. stopped at store. when returned 10 minutes later it would not start. nothing... no starter cranking, no clicking... nothing. please help...

 

1. All you ever wanted to know about batteries. Your problem, parasitic drain - page 14:
http://www.autoshop101.com/forms/hweb4.pdf

2. I would first make sure your battery posts and cable clampsare clean. You will need to disconnect and use a wire brush. Walmart may have cheap battery terminal brushes. Also make sure the starter connections are clean. Disconnect battery to clean starter terminals.