Bang & Olufsen Beosound A5 Portable Wireless Speaker (Nordic Weave) - Manual (Page 14)

Sleep and storage
With a fully charged battery, Beosound A5 can stay
in sleep mode for up to 10 days before needing to be
charged again. During this time, it will instantly wake up at
the press of the power button.
If you plan on not using your Beosound A5 for a long time,
you can activate storage mode to preserve battery. When
the speaker is switched on, press and hold the power
button for eight seconds. You will hear another sound to
confirm storage mode.
Note: To switch the speaker back on from storage mode,
you must connect it to power with a cable.
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