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Thread: Battery strength

  1. #1 Battery strength 
    Forum Senior
    Join Date
    Jan 2007
    I'm curious. A car or flashlight battery runs down. The car engine won't turn over or the flashlight doesn't come on, etc.

    What is happening when we leave the battery for a few hours and the battery then has a new surge of power? What's the physics involved that is recharging the battery from a seemingly dead state to a strong but very short last 'hurrah'? In the car, for example. the alternator isn't running so how is an almost dead battery 'alive' for a few seconds before it dies again?


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  3. #2  
    THe easiest way to explain this is the bucket and sponge analogy, so a sponge occupies 50% (one side) of the bucket, fill the bucket with water - tip it out, after a while some of the water in the sponge will seep out into the empty side of the bucket.

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  4. #3  
    Forum Professor leohopkins's Avatar
    Join Date
    Dec 2006
    Dulwich, London, England
    I think the answer you will find (and correct me if im wrong and call me an idiot) but bubbles appear on the electrice diodes (if thats where they are called - somehting "ode" anyway) - So yeah, bubbles appear on them and there is then less contact between the metal and the solution, leave it for a short while and some of these bubbles might "pop" and you'll get some contact again.

    I can get more power out of a battery by shaking it.
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.
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