[F9] CAN'T BE CAS, DON'T throw it away FIRST. .. EASY How to replace the battery 

[F9] CAN'T BE CAS, DON'T throw it away FIRST. .. EASY How to replace the battery
This video explains a tutorial on how to easily replace the tws f9 battery which previously couldn't be charged because the battery was weak/soaked
May be useful....
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