Motorola HS850 Owner's Manual page 16

Action
2 Plug the other end of the charger
into an electrical outlet.
While charging, the headset
indicator turns on and remains on
until charging is complete. The
headset will not function while
charging. Your headset fully
charges in approximately two hours.
3 When charging is complete
(indicators off), remove the charger
from the electrical outlet, press the
release tab, and detach the charger
cord from the headset.
14 Using Your Headset