Battery charger

Discussion in 'The Projects Forum' started by samjesse, Apr 2, 2010.

  1. samjesse

    Thread Starter Senior Member

    Sep 14, 2008

    I am going to buy 5 Toshiba M750 tablets and 5 additional batteries.
    Since the tablets need to be running without the charger connected for a long time, I need to have the other set of batteries fully charged and ready to go at any time.
    The power Adapter Output says 15V 5A, and the batteries are
    Li0ion Model PA319U-5BAS
    DC 10.8V 4700mAh

    I counted 10 connectors sticking out of the place where the battery sits and connect to corresponding connectors in the battery.

    I am thinking to run the tablet without the battery, find out which of the 10 is the + lead and which is the - lead and custom make a connection to plug to the battery externally in order to bench charge the spare 5 batteries.

    Is this the way to go?

  2. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    Lithium batteries usually use internal electronics to control the charge and discharge.

    These use the I2C bus to communicate with the controlling computer.

    You would have to buy or build an 'SBS' compatibe charger.

    You can find the comms & charging specifications here:
  3. samjesse

    Thread Starter Senior Member

    Sep 14, 2008
    any idea where can I find a charger which do the job? I googled but was not able to find something which resembles a unit where the battery can go in, what do I look for? 10 pins to fit in the 10 slots in the batteries I have?