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battery cell test help

Discussion in 'Gen 2 Prius Main Forum' started by itwrx, Nov 22, 2013.

  1. itwrx

    itwrx New Member

    Joined:
    Nov 22, 2013
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    Location:
    Park City, Utah
    Vehicle:
    2006 Prius
    Model:
    IV
    Other than taking a voltage test from each cell is there any other way to find a bad cell? All cells are in the 8.13V but I know one is bad. My car keeps accelerating very slow on the gas engine only most of the time. Like a manual trans in 2nd gear. And the battery is going from charged to dead in seconds. But I'm not getting any warring lights?
     
    #1 itwrx, Nov 22, 2013
  2. nh7o

    nh7o Off grid since 1980

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    Dec 10, 2011
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    Location:
    Hawaii
    Vehicle:
    2009 Prius
    Model:
    II
    Without DTC, it is hard to be sure that the problem is a particular cell, although the sudden jumps from low to high on the SOC is a certain sign of impending failure. Does the battery fan come on loudly? Is it clean? You are in a cool place so it is probably not overheating now, but those symptoms can be heat related.

    The best way (IMHO) to check for cell status under driving conditions is to use the mini VCI tool (eBay) and look at the individual internal resistances. The ScanGaugeII will also do that.

    The cell voltages would be more likely to be noticeably divergent at low SOC, so maybe you can measure things when the SOC shows low bars.
     
    #2 nh7o, Nov 22, 2013
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