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6-12V NiMh batteries

Discussion in 'Electronic Basics' started by John, Aug 7, 2003.

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  1. John

    John Guest

    Hi guys,

    I need a NiMh battery to power a 15W lamp. What would be a good 6.0, 7.2,
    or 12V power source? I need about 4.5 amp hour (at 6.0V). What is the best
    value for the dollar? Which is best laptop, rc, cell phone, camcorder, C
    cells, etc?


    Any input would be greatly appreciated

    Thanks
     
  2. Have you looked at electric model car/truck/aircraft batteries, you can get
    them in most voltages 6 cell 7.2v being most common. 2 packs of 3000mah
    would suit well.
     
  3. Ben Pope

    Ben Pope Guest

    Then once you've chosen the most suitable pack... copy it and buy the
    charger. Buy the seperate tagged cells for half the price at somewhere like
    RS, Farnell, CPC (UK, anyway).

    Ben
     
  4. Tim Shoppa

    Tim Shoppa Guest

    If you're looking for best value for the dollar, why have you narrowed your
    choice to NiMH? They're an excellent choice for long-term cycling and light
    weight, but they aren't so good in terms of capacity per dollar. Sealed
    Lead-acid is still the winner there (although you're certainly at the
    smaller end of the lead-acid scheme.)

    Tim.
     
  5. Chuck

    Chuck Guest

    AA NiMh batteries are cheap on eBay- $1 apiece or less for high capacity
    2,000 mAh batteries. In your situation you'd need about 15 batteries, but
    this may still be your least expensive method.

    PS- NiMh AA batteries are 1.2 volts per cell, so you'd need 5 batteries in
    series to get to 6v. You'd need three sets of five batteries to get to 4.5
    amp-hours.
     
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