Ericsson W3X - Manual (Page 73)

Battery (W35 only)
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5 Battery (W35 only)
The Ericsson W35 can be powered by a rechargeable battery pack to
provide voice service redundancy in the event of a total mains power
failure. When mains powered, the Ericsson W35 will keep the battery
charged.
Note: The battery is not fully charged when delivered. The charging time
for an empty battery is about 4 hours. The battery will not charge if
the environment temperature is above 40 degrees Celsius, due to
over heating protection.
5.1 Installation of the Battery
The battery is available as an accessory and is inserted between the
AC/DC adapter and the Ericsson W35.
Figure 50 - Battery pack and power adapter
5.2 Battery Function
If a power failure occurs the Ericsson W35 automatically switches over to
battery operation. In order to extend the battery time only voice services is
available. Data services, such as USB, Ethernet and Wireless LAN
functions will be unavailable.
The Standby button on the front of the Ericsson W3x is red when
powered by battery (or when the Standby button has been pressed).
The stand by time is up to 4 hours if no telephone calls are made. Talk time
is typically 3 hours. Battery time depends on the mobile network signal
quality, battery age, and environmental temperature.
Battery pack