This project “COIN BASED MOBILE CHARGER” is designed and made with the hope that it is very much economical and helpful in many public places. It is also more beneficial to the people to. The coin based mobile phone charger is very useful to Fig 4: Flow Chart for the Coin Based Universal Mobile Battery Charger Power The salient feature of the universal mobile battery charger is that it draws power from the solar energy during the day time for charging the internal battery of the controller. a coin based universal mobile battery charger is designed and developed in this paper. This device is like a vending machine for mobile battery charging at kiosks and the user has to plug the phone into one of the adapters and insert a coin for charging at a constant current for a definite duration.