Its really strange that there are different ways of charging your Cell Phones battery, but we know only one that's plugging charger into socket and getting it charged.
So now I will share with you a new method of charging the phone, and that's using a "CANDLE". I have previously made a post for charging a phone by sending messsages you can look that here.click here
Lets get started....
Do you know the Law of Thermodynamics??
If any system 'A' and system 'B' are both in equilibrium with system 'C' then the system 'A' and system 'B' are also in equilibrium with each other.
Now when a system is at higher potential, it must give some energy to other system to come in equilibrium.
Similar is the case here. A candle gives heat energy and so this can be utilized to charge a cell phone.