Sony Vaio VGP-UHDM10 Operating Instructions Manual page 9

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Close the battery compartment lid.
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Tip: Replacing the batteries
Replace the batteries soon if the BATT indicator flashes. A malfunction may occur
if you keep using the weak batteries. Alkaline batteries are recommended.
Battery life (alkaline battery):
Under usual use*: approx. 3 months
Battery life may vary depending on condition of use.
*Based on a file of approx. 20 MB being read and written ten times, 20 times a day
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