Originally Posted by hominamad
I have a Kindle 3G. Two days ago my battery was completely charged. Usually the battery will last 2 weeks at least, with the wireless turned on. Yesterday I copied about 1000 PDF files (technical documents I need for work) to my Kindle via USB. This morning when I woke up, my battery was almost dead.
It would be. It was indexing your 1000 documents, and that takes a lot of processing power.
Type some nonsense string (I generally use 'ddddddddddd', or some such) on the home page, and click "Search". It will tell you how many documents (if any) are unindexed. It's a good idea to leave the Kindle connected to a power source while it's indexing - it does drain the battery pretty quickly.
It's absolutely nothing to do with the wireless.
As a general principle, though, I'd suggest turning the wireless off if you're not using it - it's just draining power for no useful purpose. It's only two key presses to turn the wireless on or off.