A cell phone battery charger is an electronics device used in charging cell phone batteries when used up by the instrument connected to it. This electronics device has the ability to stop charging when the battery is fully charged and starts charging when the battery voltage drops below the set point. Rechargeable cell phone charger is comprised of a special battery in a special case with a special circuit to control power flow. It allow you to store electrical energy (deposit it in the bank) and then later use it to charge up a mobile device.

 

 

CHAPTER ONE
1.0                                                        INTRODUCTION
Sometimes there is nothing worse than losing all the charges on your Smartphone especially when you are in the middle of something very important. Usually this happens at the most inconvenient time probably when you are using your phone to surf the web, in the middle of a phone call or when you are desperate to send an important email or text message. Nonetheless, in this dispensation of global village, there is never a good time!  If you are always on the move, the very last thing you would imagine is to have your Smartphone low or even empty on battery. For those who depend largely on their mobile devices, not having enough power for the battery can be a major catastrophe. How else will people reach you or how will you contact people for business or personal reasons when your phone is basically useless as it has gone off on you? All these are problem to our present time, to bring this problem to an end, Rechargeable cell phone charger was introduced which is a portable device that can supply USB power using stored energy in its built-in batteries. Rechargeable cell phone charger usually recharge with USB power.

1.2                                             OBJECTIVE OF THE PROJECT
The objective of the project is to design a device that is used to recharge small devices such as cellphone when and where there is no power supply to charge the device from mains supply. A connector is added to complete the design. The type of connector will depend on the device to be charged. Cell phones from Samsung and many other companies require the Micro-USB “type B” receptacle connector.

1.3                                         SIGNIFICANCE OF THE PROJECT
Rechargeable cell phone charger serves as an ‘extra battery’ or external charger for your phone or other electronic devices. Rechargeable cell phone charger helps to ensure longer hours of texting, phone calls, or web browsing using your mobile phone.

1.4                                                 SCOPE OF THE PROJECT
Cell-phone batteries often die at very inconvenient times, with no ac power outlet nearby. This device uses  standard AA batteries, which can be bought almost anywhere, to recharge cell phones and other portable devices like music players, e-book readers, and cameras.
The circuit chargers that typically come with cell phones and other portable devices charge the battery for a brief period of time. Then, they stop, check the voltage, and verify the temperature against an internal table before deciding to stop or continue the charging process. The charging regulation required by the battery is performed within the device getting charged, and this design takes advantage of that circuit.

1.5                                           LIMITATION OF THE PROJECT

• it can only be recharged with mains supply
• the duration of the charged when in used depend on the number of cell used.

1.6                                        PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to this study. In this chapter, the background, significance, aim, objective limitation and problem of this work was discussed.
Chapter two is on literature review of the study. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.

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