A full charge of the battery does not mean it does not have any more battery cells that can be charged.
The Lithium ions inside the lithium cobalt oxide layer are designed by manufacturers so that only half of it is used, to ensure repeat charging and discharging for maximum cycles
If your phone battery is draining too faster or suddenly then there might be chances that your device got hacked or been used remotely. because if tasks are running in the background then the battery starts Draining.
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