Sony NEX-5RL - Manual (Page 14)

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Charging the battery pack
When using the camera for the first time, be sure to charge the NP-FW50
“InfoLITHIUM” battery pack (supplied).
The “InfoLITHIUM” battery pack can be charged even when it has not been
fully depleted. The battery pack 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 you shoot.
1 Set the power switch to OFF.
2 Open the cover by sliding the
lever.
3 Insert the battery pack
completely, using the tip of
the battery to press the lock
lever.
Lock lever