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Shut down this device first.
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Slide the key latch rightwards; the battery will be unlocked with a click sound.
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Lift the battery up from its upper end.
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Insert the main battery with the contact pins facing the lower end. Fix the lower edge of the battery first.
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Then push down the upper end. The battery latch will fit into place with a click sound.
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Lock the battery in place to keep it secure.
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Almost done!
Finish Line