Sony MZ-B100 - Manual (Page 10)

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Charging the built-in battery for the clock
When you use the recorder for the first time or after a long period of disuse, charge the
built-in battery for the clock. After setting the clock, leave the dry batteries installed for
about more than two hours so that the built-in battery is automatically charged. You can use
the recorder while charging. When the built-in battery is charged, the settings, such as
clock, will remain for about one month after dry batteries are taken out. For details on
setting a clock, see page 25.