I am 99% sure that I've got a dead laptop battery here, but I thought I'd post the symptoms here in hopes of some confirmation.
Basically, I am getting no longevity out of them. I'll charge them up to 100%, and switch to battery power. It will say "2 hours remaining" or something close to that. It will fairly quickly (over the course of 10-15 minutes) drop to 84% life. It should still be good for a while at 84% though, but it shouldn't decline 16% in 10-15 minutes. Then, for seemingly no reason at all, it will fall to 11%. It won't even go through everything in between, it'll just go to 11% immediately. Then I get "Low battery warning". This battery is probably almost 4 years old, and I am pretty sure it's culpable here. Is there anything else that might be causing this? Especially the rapid drop in remaining charge?