page_title: Battery charger
section_title: Mobile phone charger
hierarchical_section_title: Battery charger / Applications / Mobile phone charger
caption_attribution_description: Deutsch: Micro USB Ladekabel für Mobiltelefone English: MicroUSB charging cable for mobile phones. The device shown is a Nokia 5610 XpressMusic phone.
context_page_description: A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it.
  The charging protocol depends on the size and type of the battery being charged. Some battery types have high tolerance for overcharging and can be recharged by connection to a constant voltage source or a constant current source, depending on battery type. Simple chargers of this type must be manually disconnected at the end of the charge cycle, and some battery types absolutely require, or may use a timer, to cut off charging current at some fixed time, approximately when charging is complete. Other battery types cannot withstand over-charging, being damaged, over heating or even exploding.
  The charger may have temperature or voltage sensing circuits and a microprocessor controller to safely adjust the charging current and voltage, determine the state of charge, and cut off at the end of charge.
  A trickle charger provides a relatively small amount of current, only enough to counteract self-discharge of a battery that is idle for a long time.
context_section_description: Most mobile phone chargers are not really chargers, only power adapters that provide a power source for the charging circuitry which is almost always contained within the mobile phone.  Older ones are notoriously 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.
  China, the European Commission and other countries are making a national standard on mobile phone chargers using the USB standard.  In June 2009, 10 of the world's largest mobile phone manufacturers signed a Memorandum of Understanding to develop specifications for and support a microUSB-equipped common External Power Supply (EPS) for all data-enabled mobile phones sold in the EU.  On October 22, 2009, the International Telecommunication Union announced a standard for a universal charger for mobile handsets (Micro-USB).
caption: Micro USB mobile phone charger
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