Verykool R13 - Manual (Page 10)

5
 Dig out the bottom of the battery and get the
battery out.
 When installing the battery, insert the metal
teeth at the top 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.
1.1.2 Charging the battery
When the power of the battery was lower than
normal, the phone will prompt battery low. Please
charging for the battery, otherwise you will lose