Good morning! Ok here's the deal. I've purchased a used thinkpad a few month ago. The laptop itself works fine, there is no problem with the functionality of it. However since then, I've already had a head crash on the hard drive. It was a Hitachi hard drive and you guys know about them and their crappy reputation with notepad HDs. I've since replaced it with a IBM travelstar, and I think that should solve that problem. SInce that problem, I've noticed a weird problem with the battery. I plug it in and charge the battery fully, then I use the laptop for about 15 to 20 minutes, then it prompts me that I should save any unsaved data and charge the battery or plug into the wall immediately. SO it goes from 100% down to 3% very quickly. The weird part is that it does not descend. I mean it just jumps from 100% down to practically nothing in the snap of a finger. I would have guessed that it would go down to 90% then 70% then 50% etc.... Being a relatively new Laptop owner, I'm not familiar with the way a battery craps out. I would have thought it would be a gradual deterioration, not a sudden meltdown. I must add that I leave the laptop in the docking station when not in use, in a constant charging state. Is this wrong? Am I supposed to unplug it from the wall as soon as it's fully charged? Also, I use a power inverter occasionally and use it in my truck. Would this have any effect on it? Basically, I am trying to get a good feel for the Do's and don'ts, as I am obviously going to have to buy a new battery, and I don't want to make the same mistake twice! Or maybe the battery was crap to begin with, and it was just it's time. It was used after all. Thanks in advance.