Ivoclar Vivadent Bluephase Style Mode D'emploi page 10

Since the battery is an expendable part, it has to be
replaced after its typical life cycle has expired after
approximately 2.5 years. See battery label for the age of
the battery.
Battery charging status
The respective charging status is indicated on the
charging base as described on Page 5.
10
Click & Cure corded operation
Bluephase Style can be used in corded operation at any
time, but particularly when the battery is completely
empty.
For this purpose, remove the battery from the handpiece
by pressing the battery release button.
Then remove the power pack from the underside of the
charging base. Do not pull on the power cord.
Insert the connection plug straight into the handpiece
until you hear and feel it click into place.
During corded operation, the charging base cannot
charge the battery, since it is not connected to a power
source.