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Replacing Li-ion Battery

Discussion in 'Power Electronics' started by WOJO, Dec 13, 2011.

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  1. WOJO

    WOJO

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    Dec 13, 2011
    Hello everyone! I am looking to extend the life of my portable speakers. Contained is a 14.8v (1050mAh) Li-ion battery. Can I purchase a similar 14.8v Li-ion and just connect it in parallel to the other battery to obtain a longer ON time, or will doing so disrupt my circuit?

    Also, the input to the speakers is 12v, yet the battery is 14.8v. I would assume the circuit converts my input to 14.8v and then the Li-ion battery tells the circuit when it is full and does not need any more charge. If I connect another battery back, can I still use the same input to charge both of the batteries in parallel at the same time? Thanks for your time.
     
  2. davelectronic

    davelectronic

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    Dec 13, 2010
    Hi WOJO.
    Welcome to the forum.
    Two batterys in parallel is not ideal, one, the weaker one will pull the other one down, there is always slight difference in battery cells, i would look for the same voltage, but a larger Ah (amp hour ) battery, it will take a bit longer to charge, but not much i doubt. :)
     
  3. WOJO

    WOJO

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    Dec 13, 2011
  4. davelectronic

    davelectronic

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    Dec 13, 2010
    Yes i believe it would, but unless the charging circuit was modified it would take that much longer to charge i would think, and then you have connections etc, compatible or not, i dont know that. :)
     
  5. WOJO

    WOJO

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    Dec 13, 2011
    Awesome, thanks for the help!
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    There are some issues with placing batteries in parallel. You can get one rapidly discharging into the other if a cell fails.

    Better probably to get a larger battery and replace the existing one.
     
  7. WOJO

    WOJO

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    Dec 13, 2011
  8. davelectronic

    davelectronic

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    Dec 13, 2010
    I cant see a problem using that circuit as a battery monitor, ive actually been looking for a circuit in one of my electronics magazines, i cant find it for love or money, i think its the same as the circuit thats in your link, so long as you can charge your extended battery, and charge it when it needs it, there should be no problem.

    I was at a bit of a loss with some battery configurations, believing parallel batterys was not a good idea, i think its got its pit falls, but many design ideas have little issues, a half dead series battery will pull the other cells down, i found the link below interesting. :)


    http://batteryuniversity.com/learn/article/serial_and_parallel_battery_configurations
     
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