Verykool s810 - Manual (Page 12)

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 When installing the battery, insert the metal contact at the bottom
of the battery into the corresponding slot of the mobile phone, and
then press the battery down to install it in place. The battery must be
ensured to be installed before power on.
 Finally install the back cover of the mobile phone.
1.2 Charging the battery
When the power of the battery is lower than usual, the phone will
prompt battery low. Please charge the battery; otherwise you will
lose unsaved files. If you don’t charge for a long time, the phone will
be powered off automatically.
When charging, the battery icon at the upper corner of the screen
will appear in a charging state. During the charge, the phone and
charger may heat up a little bit, which is considered 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 only use the charger provided by
the supplier. Application of unauthorized charger may trigger
danger and breach the mobile phone maintenance warranty.