OK... Here's the problem.
This is a HUGE issue with powerbooks of 1.67ghz and 1.5ghz, at least in my mind. I have a 1.5ghz which is mine and a 1.67ghz which is my fiancee's.
We both had recalled batteries in the powerbook battery recall a few years back.
We were both sitting pretty with 2.5-3 hour charges still being held on our replaced batteries until about 2-3 weeks after installing Leopard (around the second week of Nov.) in her machine her charging capacity went to 0% OVERNIGHT.
I was like WTF?! So I called Applecare and they agreed to send me a new battery right away, citing that this was a "known issue" I swear the Applecare Agent used those exact words.
No problem, got the new battery, everything's good... within 2 weeks I am talking to 4 of our friends who have experienced the SAME thing with their 1.67ghz machines, 3 of them had upgraded to Leopard, one was still running Tiger. We all went to art school together so we all bought our computers around the same time, except myself, I had purchased mine a year prior to everyone else, hence why I have a 1.5ghz... Some people go them online online, some over the phone, some from a local apple shop.
NONE OF THEM GOT ANY SATISFACTION FROM APPLE WITH THIS ISSUE. They all ended up paying for new batteries or in 2 of the 4 cases new logic boards.
So a few months later (Jan or Feb) I come home after a weekend away, and I had left my powerbook 1.5ghz plugged in and turned off. I unplugged it, and wen to fire it up, and got NOTHING. I checked the charge on the battery. I just got one quickly flickering green LED on the bottom.
My powerbook had just experienced the SAME issue. This time when I called Apple (I am clearly out of applecare at this point) I got nowhere. I spoke to a level 1, 2 , and finally a 3 or "Supervisor" none of whom were helpful to me, none of whom wanted to hear me out. And the last of whom was EXTREMLY rude when I suggested that it had to be the same issue that my Fiancee had experienced. They even looked up her case and said they didn't know why her battery was replaced etc...
At this point I emailed
Sjobs@apple.com. Clearly stated the issue, and within 2 days I was on the phone w/ a wonderful lady named Linda from apple executive relations. She was happy to let me speak with a "powerbook engineer" and we went through some trouble shooting on the phone, the 3 of us together. They both heard me out about my Fiancee's case, and then my case.
In the end they sent me a new battery and that seemed to fix the issue w/o any problems.
My point is that I think it's a more widespread problem than Apple will ever recognize as is the norm for them. There's numerous threads about this and similar issues on Apple Discussion boards.
In the end what I'm saying is BE CAREFUL especially this close to the end of applecare, when you get it back from them, run the hell out of it and make sure that everything is to your liking. If it's not send it right back. Report all of your issues clearly and quickly.
Sorry for the long post/semi rant, but people need to know this stuff.