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Need advise on charging Li-Ion battery

Discussion in 'Power Electronics' started by Jouellet, Mar 20, 2016.

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  1. Jouellet

    Jouellet

    86
    19
    Feb 2, 2015
    Hi folks,

    I bought a couple of these:
    http://www.ebay.com/itm/121845454110?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT

    and a couple of these:
    http://www.ebay.com/itm/351633458803?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT

    my need is to put 2 batteries in serial, in parallel with 2 more. (2x2 arrangement: 7.4V, double capacity)

    I'm planning on using one of the charger module, so here are my questions:

    #1: Since batteries are 3.7 volts, does the module needs to be fed with 7.4 Volts or a higher value should do: module would regulate the voltage ?

    #2: Can I use 1 module to charge the 2x2 arrangement, or do I need 1 module per serial pair ?

    thanks
     
  2. Alec_t

    Alec_t

    3,053
    833
    Jul 7, 2015
    The charger module datasheet should specify the input voltage range.
     
  3. Jouellet

    Jouellet

    86
    19
    Feb 2, 2015
    Alec_t: if you find the proper datasheet, let me know !
     
  4. Colin Mitchell

    Colin Mitchell

    1,416
    314
    Aug 31, 2014
    You can really only charge 1 cell at a time. The charger only charges 1 cell at a time.
    You will have to add a switch to separate the parallel cells.
     
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