Macbook air swollen battery recall5/17/2023 Batteries have a limited number of “cycles” unplugging uses those cycles, and that reduces the batteries longevity. With Li Ion batteries you leave them plugged in. He was thinking about the older type of batteries. Side note: if you have a MBP that has a swollen battery AND that battery caused additional damage, like breaking the trackpad and/or the top case it isn’t uncommon (though not guaranteed) for Apple to replace the trackpad and top case at no charge when you pay to replace the battery. However, over-charging is one reason why batteries swell so perhaps the guy at the Apple Store was just confusing the two. That won’t necessarily cause the battery to swell but can result in a battery that just won’t hold a charge. Leaving the MBP plugged in to power continuously can wear the battery out in a fairly short time (I mean that in the sense of someone who uses their MBP as if it were a desktop computer so it just sits there for a couple of years, plugged in). The replacement eventually swelled too, but fortunately these batteries were easily removable, so I just took it out and gave up on batteries for that one. I pointed out to him that all of the laptops in the store were also plugged in with charged batteries, but he stuck to his story. I had to replace a swollen MBP battery several years ago (with the same trackpad problem described above), and at the time the guy in the Apple store told me it was my fault for leaving the laptop plugged in after the battery was fully charged.
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