Question

How the battery for Mobile phone dies ?​

Answer 1

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How to revive dead phone battery?

Remove the connections once the cell phone batterygets a little warm to touch. Insert the cell phone batteryback into your phone and check to see if your phonepowers on. Check the battery level once your phone is on. If the level is low, plug the phone into a charger and wait until it is fully charged.

Plug the phone into the proper charger and allow the device to charge for 48-hours. After the device has charged for 48-hours, turn thedevice on and check the batteries power level. You may find that your once dead battery is revived, and is now able to hold a charge again.

$<marquee behaviour = red ><h1> hope it helps u </h1></marquee>$

Answer 2

Mobile battery dies when Lead or zinc sulfate get old or corrupt.

When Lead or Zinc get old then the chemical power of battery get end and no power was given to phone. Even if we charge our phone but no current was pass though battery due to  this phone will can't be charged.