Battery Charging Questions

Discussion in 'General Electronics Chat' started by Satya Harsha, Dec 7, 2017.

  1. Satya Harsha

    Thread Starter New Member

    Dec 7, 2017
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    Hello everyone!
    In my project i want to charge two batteries connected in series,each 3.7V
    can i do it with 5V charger
    i.e., can 7.4v battery charged with 5v charger?
    and what will happen if we do?

    hope everyone got my question
     
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
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    Charging voltage must be higher than battery voltage, so no a 5 volt charger will not work.
     
  3. bertus

    Administrator

    Apr 5, 2008
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    Bernard likes this.
  4. dl324

    AAC Fanatic!

    Mar 30, 2015
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    You can't get something from nothing. Battery won't charge.
     
  5. BobTPH

    Active Member

    Jun 5, 2013
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    The real answer is yes, but...

    You would need a boost converter to create a higher voltage, amd a smart charging circuit including balancing for the two cells.

    Bob
     
  6. ian field

    AAC Fanatic!

    Oct 27, 2012
    5,711
    1,013
    Charging lithium cells can be dangerous if you don't do it right. The options are; buy 2 USB to lithium charger boards and charge the cells separately, or use a boost converter to generate the required voltage overhead and buy a cell balancer board.
     
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