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Back in college I worked as a iOS and Mac technician at a Apple Store Genius Bar. First couple of months working there I noticed we had a yellow safe under our bench. My supervisors informed me the safe was for swollen batteries, hot iPhones or anything that could explode or catch fire.

Needless to say I only ever experienced one dangerously swollen battery on a MacBook. Food for thought.

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I recently bought a Macbook Air that had a battery so swollen that the entire laptop was convex and the lit couldn't even close. I'm talking a two inch bulge.

What's amazing is that nothing broke and changing the battery allowed the aluminium to bend back and you can't even tell that the laptop looked like that.

The person that had it before me was actually using the laptop with the swollen battery until it got so bad some of the keys were getting pressed from under. That person could have easily used the laptop in question in a plane.

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