Sony DSC-W730 - Manual (Page 168)

It is recommended to charge the battery pack within the proper charging temperature range between
10°C to 30°C (50°F to 86°F).
For details, see “ Battery pack ”. [Details]
The battery is not charged even if the Charge lamp turns off and charging is
finished.
This happens when you charge the battery pack in an extremely hot or cold location. Charge the
battery pack within the proper charging temperature range of between 10°C to 30°C (50°F to 86°F).
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