Zte WF720 User Manual page 6

3.. Insert.the.battery.connection.cable.into.the.battery.port.
4.. Place.the.battery.in.the.battery.slot.and.replace.the.battery.cover.
NOTES:
 . The. system. will. stop. charging. the. battery. when. the. ambient. tem-
perature.is.outside.of.the.temperature.range.allowed.for.charging..
(0.°C.~.55.°C).
 . When.the.power.adapter.is.connected,.the.battery.will.automatically.
be.charged.
 . When.fully.charged,.the.battery.will.automatically.stop.charging.
 . Remove.the.battery.if.the.device.will.be.unused.for.a.long.period.
 . The.battery.is.intended.for.backup.purposes.only.(in.the.event.of.a.
power.failure).
 . The. device. takes. about. 5. hours. to. charge. fully.. The. charge. time.
may.be.impacted.by.environmental.factors.