Verykool R620 - Manual (Page 9)

4
1 Start Using
1.1 Battery
The battery is attached with the mobile phone. The battery is not
charged when the mobile phone is purchased but can support
powering on. Please recharge it for use after completely using up
the battery for the first three times, which makes this battery easier
to achieve the best using state.
1.1.1 Uninstallation and installation of battery
 Put the back of the mobile phone upward, move the cover button
to the right to release the cover, then take off the rear cover
according to the chat below.
 Dig out the bottom of the battery and get the battery out.