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<blockquote data-quote="MacInWin" data-source="post: 1775282">Spiff1972, batteries don't swell because they are being used. They swell because gasses are released inside them. They don't go down with non use, either. Once they swell, they stay swollen. The more swelling, the more dangerous they are, too. Eventually the gas pressure can build up so high the battery splits and the gas escapes. It's flammable, so if there is a heat source or spark nearby, it can burst into flame. So you cannot discard the concern for the battery just because you rest the battery each night. About the only way to know if the battery is swelling is to look at it. Or you can wait until it distorts the case. If the MBP doesn't rest flat but can be rocked just a bit, then the battery is swollen, distorting the bottom case. Or the trackpad is harder to press to get a click, and less responsive in general.I'm not saying your battery is swollen. I don't know if it is or not. It's up to you whether to investigate or not. But if the case rocks on a flat surface or the trackpad starts being difficult to press, I'd say it's 90% probable the battery is the culprit.</blockquote>

[QUOTE="MacInWin, post: 1775282"] Spiff1972, batteries don't swell because they are being used. They swell because gasses are released inside them. They don't go down with non use, either. Once they swell, they stay swollen. The more swelling, the more dangerous they are, too. Eventually the gas pressure can build up so high the battery splits and the gas escapes. It's flammable, so if there is a heat source or spark nearby, it can burst into flame. So you cannot discard the concern for the battery just because you rest the battery each night. About the only way to know if the battery is swelling is to look at it. Or you can wait until it distorts the case. If the MBP doesn't rest flat but can be rocked just a bit, then the battery is swollen, distorting the bottom case. Or the trackpad is harder to press to get a click, and less responsive in general. I'm not saying your battery is swollen. I don't know if it is or not. It's up to you whether to investigate or not. But if the case rocks on a flat surface or the trackpad starts being difficult to press, I'd say it's 90% probable the battery is the culprit. [/QUOTE]

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