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Lithium battery life.

  1. Jan 30, 2014 #1
    I got a lithium battery pack for my ski glove. On high it last for 2 hour, 4 hours for medium but on low it only last 3 hours. Why does the battery not working long on high? Does the cold weather affect the batteries from operating at its peaks power. Would it be better if I use some type of extra insulation around the battery pack so the battery would be cold.


    thanks for the help.
     
  2. jcsd
  3. Jan 31, 2014 #2

    davenn

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    hi johnny
    welcome to the forums :smile:

    the battery doesnt last as long on high because more current is being drawn from it, that reduces its operating time before a recharge

    not sure why it would operate for less time on low than on medium, unless it's already been used for a while on one of the other power settings ??

    cheers
    Dave
     
  4. Jan 31, 2014 #3

    NascentOxygen

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    Hi Johnny_B! First, have you confirmed that the setting marked "LOW" is actually the lowest heat setting; maybe it is wrongly wired and is really the MEDIUM heat setting? :smile:
     
  5. Jan 31, 2014 #4
    What I meant to ask is why is the batteries not lasting longer on low setting.

    I will do a test on each setting today and post up some result so that ya can see.


    Sent from my iPhone using Physics Forums
     
  6. Jan 31, 2014 #5

    NascentOxygen

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    Coincidently, that is the very conundrum I was addressing. :smile:

    Good idea!
     
  7. Jan 31, 2014 #6

    mfb

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    If the batteries are very cold (with "low" setting?), they can discharge quicker. On the other hand, this discharging should make them warmer, stopping the effect...
     
  8. Jan 31, 2014 #7

    NascentOxygen

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    Are you talking about self-discharge? This over a period of months?
     
  9. Feb 1, 2014 #8

    mfb

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    Self-discharge is not an issue within hours, but I think the internal resistance depends on the temperature, too.
     
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