Disconnect the shaver from power
Remove the shrew located at the botton by the power socket.
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Pull lid down and up
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Remove rubber hand grip by un-clipping top end and pulling up
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Remove the top silver ring by pulling on it
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Remove the 6 screws around the battery cover
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You can now pull the old battery out and put the new one in
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Note the orientation of the battery
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Re-assemble in reverse order.