Nokia 1661 User Manual page 23

Battery
Type
BL-4C
are estimates and only possible under optimal
network conditions. Actual battery talk and standby
times depend on SIM cards, features used, battery
age and condition, temperatures to which battery is
exposed, network conditions, and many other
factors, and may be significantly shorter than those
specified above. Ringing tones, hands free call
handling, use in digital mode, and other features will
also consume the battery, and the amount of time a
device is used for calls will affect its stand-by time.
Likewise, the amount of time that the device is
turned on and in the standby mode will affect its talk
time.
22
Battery
Li-Ion
Important: Battery talk and stand-by times
Talk time
Up to 8
hours
Standby
Up to 472
hours