Sony NW-A25 How To Use Manual page 215

Help Guide
The battery life is short.
If your Walkman is used in an environment where the temperature is
below 5 °C (41 ºF), the battery life becomes shorter due to
characteristics of the battery. This is not a malfunction.
Charge the battery until it is full.
The battery life can be extended by using wired headphones instead of
Bluetooth audio devices.
More battery power is consumed when the Bluetooth function is used.
More battery power is consumed when the noise canceling function is
used.
When [Battery Care] is set to [On], the maximum recharge capacity is
limited to about 90 %, resulting in the first bar of the battery indication
disappearing quickly.
You can preserve the battery life and get more use from each charge
by changing your Walkman settings and managing the power
appropriately.
Depending on the environment in which your Walkman is used, the
battery may deteriorate if it is not used for over a year. Contact your
nearest Sony dealer.
If the usable battery life is half that when new even after sufficiently
charging the battery, your battery may have deteriorated. Contact your
nearest Sony dealer.
[247] Troubleshooting
How long is the standard battery duration?
For details on the battery duration, see "Battery life."
[248] Troubleshooting
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08/06/16 16:25