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Of course, the mobile phone battery charger can be charged directly, which is the early method of mobile phone charging. The current mobile phone structure is fixed in the mobile phone with a battery, so that it can not be disassembled and can only charge the battery through the mobile phone.
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The mobile phones of the 1980s and 1990s were disassembled, and the battery could be directly charged with the charger. So this is a completely achievable technology.