Sony Alpha 77 M2 (no lens included) Owner's Manual

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Preparing the camera
Charging the battery pack
When using the camera for the first time, be sure to charge the NP-FM500H 
InfoLITHIUM™ battery pack (supplied).
The InfoLITHIUM battery pack can be charged even when it has not been 
fully depleted.
It can also be used when it has not been fully charged.
The charged battery pack is discharged little by little, even when you do not 
use it. To avoid missing an opportunity to shoot, charge the battery pack 
again before shooting.
1
Insert the battery pack into the 
battery charger.
Push the battery pack until it clicks.