Zte E821 User Manual page 10

Continuous talk time
Continuous video talk time 120 minutes
* The phone's talk and standby times are based on ideal working
environments. Network conditions or, for example, use of the
extended backlight or browser, can use more battery power and
reduce talk/standby time.
10
G S M : 1 8 0 m i n u t e s , W C D M A : 2 4 0
minutes