Can my car kill a battery in 2 weeks?

I found part of the problem. AJ/FormS and others said that a Battery Tender would not charge the battery if the voltage was too low. And you were exactly right. At one time I knew that, but I guess I went brain dead. I took it back to the store, the battery voltage was about 0.1. They were able to charge it up so now I need to find the drain. The reason I said that it should not drain down to zero in 2 weeks, is because I had never had that problem in the last 2 years. I hate it when problems occur for no apparent reason, but that happens to everyone.

I plan to run a wire through my multimeter to see how many amps are draining - like one of you suggested. The MM goes up to 10 amps, so I should be good. Then I will go through your other suggestions in finding the leak. I've seen those threads before, but hoped it would never happen to me. HA.

Thank you all so much!