Verykool R620 - Manual (Page 10)

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 When installing the battery, insert the metal teeth at the bottom of
the battery into corresponding slot of the mobile phone, and then
press the battery down to install the battery in place. The battery
must be ensured to be installed before powering on.
 Finally install the rear cover of the mobile phone, move the cover
button to the left to lock the cover.
1.1.2 Charging the battery
When the power of the battery was lower than normal, the phone
will prompt battery low. Please recharge for the battery, otherwise
you will lose the files which are not saved. If you don’t charge for a
long time, the phone will be powered off automatically.
When charging, the battery icon at the right upper corner of the
screen will appear in a dynamic rolling manner. During the charging
period, the battery, mobile phone and charger will become hot,
which is a normal phenomenon.
Warning:
The stated charging temperature ranges from 0
℃ to 40℃.
Please do not use charging equipment if the temperature
exceeds the range. Please do use the charger provided by the