Battery on white MacBook shuts off abruptly after 30% charge is left I have a white MacBook (MacBook4,1). I have owned and used it for over two years now (30 months, as coconutBattery would have me believe). coconutBattery and Battery Health Monitor both report that the capacity of the battery has gone down to 82% at 4123 mAH charge capacity (with design charge capacity being 5020 mAH). The load cycles (cycle count) is 376, and the battery is reported to be in normal condition. 

Naturally, the battery drains faster now than it did, say, a year ago, or when it was brand spanking new. I don't mind that. That's understandable. What I do mind, however, and what perplexes me is that, after the battery is drained all the way down to around 30%, the MacBook shuts off in a split second. I can hear that familiar click sound from the hard-disk that comes when the power button is held down for a few seconds to forcefully shut down the system. It took me by surprise when I first experienced it. I thought that perhaps it went to sleep because the battery may have drained completely. But it never displayed any alert about low battery (the charge was still reported to be around 30% when the event happened). When I pressed the power button, the MacBook did a POST and started as it would after a cold shut-down. 

It happened to me every time I had drained the battery down to around 30%. I would think that the electronics on board the battery controller would force the system to go into hibernate (suspend/sleep) mode, while making sure there is just enough charge left to keep the system memory alive somewhere. However, as far as I can tell, obviously, the controller has no reason to think the remaining charge (at 30%) on the battery is appallingly low to warrant any such operations. But, it is as if the battery suddenly abruptly completely shuts itself off, as if its connection gets severed off there in a second. 

I am clearly out of any warranty. But, I would like to know what could be the problem here. The battery is dying, but at 82% capacity, I shouldn't think so. What do you people think?
I had the exact same problem (twice!) and had my battery replaced under warranty - I seem to recall there was a battery replacement program for this issue (don't quote me) but even if there was I suppose that would have finished now. 

I'd say you might have a chance if you called and explained the issue or went into an Apple store depending on what kind of person you run in to.

There was also a firmware update that was meant to help solve this issue, but it didn't help me and I suppose you'd have gotten that through software update long ago.

Long story short: It's not that the battery isn't holding enough charge, and not that it's had too many cycles - evidently they just had an issue with their battery production, and your machine has taken this long to be affected by it. Hopefully you get someone nice from Apple, but otherwise a trip to eBay or somewhere else on the internet should be able to get you a new battery for relatively cheap. 

Good luck, hope it works out for you.