Yealink W70B Manual page 7

Charge your phone
It takes three hours to fully charge the handset.
To start charging, put batteries into the back of
the handset, then turn it on.
Then place the handset into the USB charger.
As it charges, you'll see your phone's battery status
at the top of its screen.
Fully charged
80% charged
60% charged
40% charged
20% charged
Note: Turn off the handset before taking out its
battery or you risk losing data. And don't use a
damaged battery.
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