Battery charger, a mobile phone battery

2010-09-02 15:19:20 Author：Theone CopyFrom： Hits：0

A battery charger is a device used to put energy into a secondary cell or (rechargeable) battery by forcing an electric current through it.The charger current depends upon the technology and capacity of the battery being charged. Most mobile phone chargers are not really chargers, only adapters that provide a power source for the charging circuitry which is almost always contained within the mobile phone. They are notably diverse, having a wide variety of DC connector styles and voltages, most of which are not compatible with other manufacturers' phones or even different models of phones from a single manufacturer.

Users of publicly accessible charging kiosks must be able to cross-reference connectors with device brands/models and individual charge parameters and thus ensure delivery of the correct charge for their mobile device. A database-driven system is one solution, and is being incorporated into some designs of charging kiosks.

Mobile phones can usually accept relatively wide range of voltages[citation needed], as long as it is sufficiently above the phone battery's voltage. However, if the voltage is too high, it can damage the phone. Mostly, the voltage is 5 volts or slightly higher, but it can sometimes vary up to 12 volts when the power source is not loaded.There are also human-powered chargers sold on the market, which typically consists of a dynamo powered by a hand crank and extension cords. There are also solar chargers.

China and other countries are making a national standard on mobile phone chargers using the USB standard.Starting in 2010, Apple, Nokia, Motorola, Samsung and RIM will begin making handsets with a standard phone charger based on the micro-USB connector. On October 22, 2009 the International Telecommunication union    announced a standard for a universal charger for mobile handsets (Micro-USB).