Why longer initial battery charging ?

Discussion in 'General Electronics Chat' started by Externet, Aug 20, 2015.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Hi.
    The user manual of a gadget insists in charging for 12 hours and operate the device to full discharge the three first use cycles when new.
    Why can that be necessary, for a 4 in-series Lithium-ion cells (with no apparent charge management inside the pack) And IF there is such charging management, why anyway ?

    ----> http://cdn.shopify.com/s/files/1/0569/6685/products/battery.jpg?v=1438669605
     
  2. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    First the battery is in an unknown state of charge so you need to get it to that point (fully charged) first, then you want to be sure the reaction areas are uniform with no hot spots so it's analogous to tempering steel. You drive the reaction surfaces and electrolytes to max potential then you drain to a low potential to create a uniform structure without stresses that can later cause membrane shorts or hot spots at high discharge rates.
     
    Last edited: Aug 20, 2015
    RichardO likes this.
  3. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Thanks. Good explanation.

    I was wondering if could be from rewriting an user manual the quick easy chinese way, pasting paragraphs from an earlier model manual that used NiCd and doing the typical goofing.
    The charging process signals as completed in about two hours; leaving it charging 10 more hours perhaps does nothing.
     
  4. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    12 hours seems a little goofy if it's fully charged in 2 but who knows how accurate the charger time is to the battery SOC so they give it a large fudge factor to be completely sure.
     
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