Lithium-ion batteries are simply not meant to stay empty, so most tablets don't truly hit 0% when they shut down. Instead, they shut down with a little charge to protect the battery, which is why a low-battery screen appears when you try to turn them on. If you leave your tablet with a drained battery for days, weeks, or months, the battery continues to slowly discharge until the voltage drops too low, potentially damaging the battery's internal chemistry.
第一大判断延伸：关于“绿色通道”，你真的够资格吗？
，详情可参考PG官网
struct InternalState {
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