Sony ILCA-77M2 - Manual (Page 31)

When using the camera for the first time, be sure to charge the InfoLITHIUM NP-FM500H (supplied).
The InfoLITHIUM battery pack can be charged even when it is not fully depleted. It can also be used
when it is not fully charged. The charged battery pack discharges little by little even when it is not being
used. To avoid missing a shooting opportunity, charge the battery pack again before shooting.
1. Insert the battery pack into the battery charger.
Push the battery pack lightly until it clicks.
2. Connect the battery charger to the wall outlet (wall socket).
For the U.S.A. and Canada
For countries/regions other than the U.S.A. and Canada