Okay, so I knew I had seen the post somewhere. Here is a link to the battery replacement page. It lists the reviews of the battery. As you can seen, more than a few people had issues.
Now, my thoughts are these. Even tho Amazon says you can put your kindle to sleep, and that it doesn't drain the battery, I always turn it off when I"m not using it. I wonder if putting it to sleep doesn't drain the battery faster? Or are people leaving their whispernet on all the time which is guaranteed to drain it? At any rate, it seems to be a 'hit and miss' with the battery.