Charging the built-in battery for the clock

After setting the clock, leave the recorder with the dry batteries installed for about 2 hours to charge the built-in battery for the clock. You can use the recorder while charging. Once charged, the built-in battery should last about a month without connecting to any of the power sources. The recorder will automatically charge the built-in battery while connected to dry batteries, AC power, or a rechargeable battery.

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SONY MZ-B3 (E) 3-798-610-22(1)

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Kenwood MZ-B3 manual Charging the built-in battery for the clock