Zte R621 User Manual page 21

Installing and removing the battery
1. Make sure that your phone is off and remove the battery cover.
2. Insert the battery by aligning the metal contacts with the contacts in
the battery slot. And then push down the upper section of the battery
until it clicks into place.
To remove the battery, pull it up and remove it from the mobile phone.
3. Replace the battery cover and close it gently until you hear a click.
Remove the battery cover Push down the battery
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