Lithium Ion Battery

Discussion in 'General Electronics Chat' started by sharath_412, Jan 8, 2008.

  1. sharath_412

    Thread Starter Active Member

    May 7, 2007
    32
    0
    Hi,
    Hw much time does it take to charge a Lithium ion batter (3.7 V and 900 mAH). The adaptor used is 5 Volts 500 mA. Is there any equation which tells about this.

    thanks & regards
    sharath
     
  2. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    Hi,

    That's a fairly loaded question, ultimately it depends on your battery. Some are designed to handle higher rates of charge, whilst others cannot handle it.

    Most Lithium Ion batteries can handle a 1C rate of charge, which means that it can be charged at its capacity. In your case, 900mA. But, this cannot be reliably used to charge your battery. Lithium charging is a lot more difficult than other battery types. Usually, charging is broken down into a 'charge profile'. This means there is a precharge, fast-charge, and a slower charge cycle depending on feedback from the battery. Most chargers include basic temperature sensing, since it is dangerous to overheat the battery.

    It's pretty safe to say that your battery will take about 2-3hours to charge.

    Steve
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The charging circuit must limit the voltage accurately or a lithium battery will catch on fire.
     
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