How to charge smartphone with another smartphone (Reverse Charging) 

For your smartphone to charge another smartphone your phone need to have the feature called reverse charging
if your phone doesn't support reverse charging then don't charge any smartphone with your phone otherwise you will destroy the strength of your phone's battery or even cause damage to your phone battery.
for some smartphones at 30% or 20% your phone will not be able to charge any other phone , this is to also conserve your phone's battery life
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