Criteria for new battery and case

So I went to my local authorized apple repair place today and talked for quite a while to a very nice genius who left me more confused than ever about how bad a battery needs to be to warrant replacement. There seem to be no clear criteria.
What my battery does is vacillate between believing it has 30% of its original capacity left after 142 cycles and 80%. It lasts about an hour to an hour and a half on battery with bluetooth and airport off and the screen dim, and lately it has begun shutting off suddenly while on battery power.
When I visited the store today, it happened to believe it had 78% of its original capacity left, and it didn't shut off while he was watching it. Apparently 78% capacity was not bad enough to warrant replacement, because he asked if I could either leave the macbook with him for testing, or come back and show him what happens, if I can figure out what triggers the changes in capacity or the sudden shut-off. He said that no log would show a sudden shut-off like I was describing, so he would have to see it himself.
This left me pretty confused, since I thought that even the 78% was low after 142 cycles compared to what other people were reporting. I wonder if there are any objective criteria so that we can KNOW if our batteries are among those that need replacing.
As to the case, I have better news. Mine is one of those cases that has cracked very near the edge, under the right-hand magnet. After examining the rest of the case to make sure it showed no evidence of dents or scratches to suggest it had been dropped, he agreed right away to replace the case and has ordered a new one for me. He seemed to know of the problem and of Apple's willingness to replace such cases.
So that leaves me this weekend trying to figure out when and why my macbook shuts down when it's on battery power so I can reproduce it for the genius ....weird!

I had the same problem with my computer shutting down at 30 minutes left on the battery. You might be better off calling the number in the update. I explained to them the problem and I had a new battery two days later and then you just send the old battery back. No cost.
If you go back to the store ask to speak to the manager. Sounds like you got a genius that is not to bright. If you know when you battery is going to shut off your computer you could have enough on your battery to start it up and after a few minutes when it reaches that point it shuts down.
Mine was always at 30 minutes. You should not have to jump through hoops since this is a known problem.
Mort

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