Intex U-AA Power User Manual page 19

Install: ⑴Match the metal contacts of battery separately with
the battery compartment metal contacts, and put the battery
base into the slot;
(2) Slide the back cover toward the top of the phone to lock
the cover into its place.
3.1.2 Charging
Connect the charger to a power supply, and then plug in the
charger pin to the charger jack on the bottom.
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