Lithium battery life.

  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. davenn

    davenn 3,385
    Science Advisor
    Gold Member
    2014 Award

    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. NascentOxygen

    Staff: Mentor

    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. 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. NascentOxygen

    Staff: Mentor

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

    Good idea!
     
  7. mfb

    Staff: Mentor

    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. NascentOxygen

    Staff: Mentor

    Are you talking about self-discharge? This over a period of months?
     
  9. mfb

    Staff: Mentor

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