OK. After your phone shuts down automatically, remove the battery and replace the battery.

在你的手机自动关机后，移除电池一会再装上。

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Replace the battery every two years — critical level log records will begin to appear before that.

每两年更换一次电池——否则会出现临界级别的日志记录。

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It has the function of low voltage alarm. This could remind the user to replace the battery before used up.

具有低压报警功能，电尚未耗尽之前及时提醒用户更换。

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The document gives step-by-step instructions on how to remove the LCD, replace the battery and other tasks.

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And Apple won't give you a blueprint for the iPhone's insides so could replace the battery yourself.

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Is there an option for an owner to replace the battery?

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