Lithium-ion batteries have terrific properties that have caused a revolution in everything from tiny flashlights to Ford trucks. Yes, you have to take them seriously if they show any sign of having a physical failure, such as swelling or smoking, but that is fortunately an incredibly rare occurrence relative to the vast number of lithium-ion batteries in use. Wearing down over time is quite common and can be frustrating as a Mac laptop owner, used to many hours of use,
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