Samsung SM-J260M/DS User Manual page 14

Basic
Removing the battery
1
Remove the back cover.
2
Pull out the battery.
Charging the battery
Charge the battery before using it for the first time or when it has been unused for
extended periods.
Use only Samsung-approved chargers, batteries, and cables. Unapproved
chargers or cables can cause the battery to explode or damage the device.
Connecting the charger improperly may cause serious damage to the device.
Any damage caused by misuse is not covered by the warranty.
To save energy, unplug the charger when not in use. The charger does not
have a power switch, so you must unplug the charger from the electric socket
when not in use to avoid wasting power. The charger should remain close to
the electric socket and easily accessible while charging.
1
Connect the USB cable to the USB power adaptor.
1