Lenovo H02 User Manual page 6

Charging
The new headset has enough power to support you to complete pairing
and dial a small number of calls. When the headset is connected to iOS
device, headset's power volume will display at upper right corner of
device screen.
image sampler
W hen the bat ter y is low, there are voice reminder s: "bat ter y low".
Indicator light in red during power charging, in blue when battery is fully
charged.
Note: If do not charge the headset for long time, the battery life will be
shortened. Recommend to charge the headset at least once a month.
Power Bank
usb adapter personal computer power bank
You can charge the headset
via these devices