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rechargeable batteries

Discussion in 'Electronic Design' started by zooz, Oct 5, 2007.

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  1. zooz

    zooz Guest

    How can I charge a rechargeable battery in the lab, what's the
    'reverse connection'?
  2. Phil Allison

    Phil Allison Guest


    ** You use the normal connection - ie positive battery terminal goes to
    positive terminal of the charger.

    But the charger has to have higher voltage available than that of the

    Plus, you need to add a resistor in series with the DC supply to limit
    current flow.

    The charging reaction commences immediately and the voltage on the battery
    can be seen to gradually rise on a sensitive volt meter.

    What happens next depends entirly on the kind of battery, its size and the
    current flow you set up.

    ....... Phil
  3. zooz

    zooz Guest

    i have another question,

    -i have to charge two 1.2 v batteries, do i connect them in series and
    then the free positive terminal to the positive of the charger and so
    the negative?
    -and how do i know the limit of the current?

  4. Phil Allison

    Phil Allison Guest

    "Phil Allison"

    ** No surprise......

    ** Series is OK.

    ** Gotta know all about the particular cells for that one !!

    The maker's web site usually has the info - or it may be written on the
    cell's jackets.

    ....... Phil
  5. John B

    John B Guest

    WTF. Go and buy a $5 charger from WalMart.

    Next question.
  6. What sort of battery (NiCd, NiMh, Lithium, lead-acid, etc)?
  7. D from BC

    D from BC Guest

    I'm wondering if any of those battery chemistries can be safely
    charged by temperature monitoring..
    Assume one doesn't have datasheets and doesn't care about charging
    damage..(Survivor Man does battery charging... )
    I dunno...let's say charging up to an external battery temp of 40C???

    D from BC
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