Chapter 9: Energy efficiency
Recommendations on how to save energy:
• Do not charge a battery when the ambient room temperature is above +40° C or below +5° C
(above 104° F or below 41° F). Charging below +5° C harms the battery and shorten the
lifetime.
• Note that storing Li-Ion batteries at high temperature dramatically reduces its capacity. For
example storage 60° C reduces capacity with 20% in less than a month, permanently.
• Set the handset screen saver to the
Black also in call
option. The screen goes black and the
backlight is turned off. The backlight also turns off when the handset is in call. This helps to
extend the battery life when the user is on an extended call.
• The handset can be configured to switch off when located in the charger. When removed from
the charger the handset switches on automatically.
• If the charger is not used for a longer period of time, remove the power adapter to the charger.
• Do not put the handset in charger when charging is not required.
August 2019
Using 3735 DECT handsets with Communication Manager and IP Office
123