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Li-ion vs LiFePo batteries

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  • #31
    Originally posted by ESR_RSE View Post
    I might cut back open those K2 packs and put in a different BMS that is closer to the cell output max.
    So I grabbed four cheap 4S LiFePO4 BMS units to see if the K2 cells work closer to their specs

    BMS Parameters:
    Maximum operating current: 30A
    Maximum instantaneous current: 56A
    Over charge voltage range: 3.75V±0.05V
    Quiescent current: less than 30uA
    Internal resistance: less than 20mΩ

    3P LFP26650EV cells should be 36A operating max w/ 86A instant max.

    Another little benefit will be to add another parallel connection across the batteries in the middle. Resolves the issue of the weakest battery from the weakest pair being the one that cuts out. (other "bottom" battery can help on the amp draw)

    additional_wire.jpg
    Last edited by ESR_RSE; 10-24-2019, 04:31 PM.

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    • #32
      So what are some inexpensive Lithium battery packs that I can purchase that can hold up to when I upgrade to a Torkinator motor ??? Thank you for reading and any info given.

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