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what's up with nicad batteries?

Discussion in 'Home Power and Microgeneration' started by Anonymous, Oct 11, 2007.

  1. Anonymous

    Anonymous Guest

    We use a fair amount of batteries, mostly aa and aaa, to power various
    gadgets. I would be willing to invest in nicad batteries if they really
    worked, but the last time I did that about 5 years ago, they did not
    hold a charge very well.

    Have things improved any? Does the kind of charger you use make any
    difference?

    Any recommendations?

    Thanks
    ..
     
  2. Eeyore

    Eeyore Guest

    Nicads have been eclipsed by NiMH batteries.

    Both have suffered from loss of charge issues but recent NiMH technology from
    certain manufacturers has improved that. Sorry but I forget which brands
    offhand.

    Graham
     
  3. Eeyore

    Eeyore Guest

    For sure in the past, an alkaline battery would have been the best bet in such
    situations.

    There are a few manufacturers of improved NiMHs who are now selling them 'ready
    charged' just like alkalines. Apparently they will hold at least 50% of their
    charge for a year.

    Graham
     
  4. Ecnerwal

    Ecnerwal Guest

    Use NiMh. But it matter both what you are using them for/in, what
    charger you use, and how well you maintain things.

    If you believe in memory effect, please go flush your brain until you
    don't, or until you only believe that it applies to specific situations
    run into on satellites with NiCd - and you're being told to get NiMh.

    Running rechargables "totally flat" is bad, leaving them flat is worse
    (if you must run them "out", then recharge immediately). Recharge early
    and often is the current conventional wisdom.

    If not using them for a month or more, recharge them every month, or
    you'd have been better off with non-rechargeables.

    Putting it in a long-term low-draw item like a clock - buy a
    non-rechargeable.

    Charger - I like a "smart" one - present version I have will charge 1-4
    cells to 80% in 15 minutes - has temperature sensing, a fan, charges in
    pulse mode, doesn't fry batteries that are left in it for days or weeks.
    Could be a bit better in that it does not have a definitive indication
    when it's done with the last of trickle charging, but it does what I
    want one to do, having had poor experiences with trickle-charging
    versions.

    Sets. Mark batteries to maintain "sets" to fit your appliances, and
    keep/use/charge each set together.

    Shop carefully - you can easily pay 3-4X the price for exactly the same
    thing by shopping carelessly, or you can be mislead by something
    described as a "rapid" charger which defines "rapid" as "8 hours"
    somewhere in the fine print. Look for larger packages of batteries,
    which might be cheaper per battery - 20 packs, for instance.

    Works for me. I've been feeding them to the heavy-draw AA stuff around
    here and it's been working fine for several months - no way to tell how
    it will be in the longer long term, but it's already cheaper than
    disposables would have been (mostly because those cost so much).
     
  5. That is because they are just the AAs in an adapter sleeve to make them fit
    in the place of a D. They have them in a C size adapter also. When I first
    saw these faux C and D size rechargeables at wal-mart I wanted to slap
    sombody. You can buy the sleeves here
    http://www.greenbatteries.com/battery-adapter.html (it is the first link I
    clicked on from a google search)
     
  6. Used to have them at Walmart ,but they vanished about 5 years ago.
     
  7. Been there done that for about 10 ten now.....on flashlights it don't harm
    to get
    led's if you using it a lot.On night deliveries led's and rechargeable
    batteries last as many
    as the old flashlights and non-rechargable did in days roughly.You have
    throw that rechargable
    out after 100th charge though I had some that last out to 200 charges.A lot
    of what used was
    RayoVac rechargable.
     
  8. Guest

    Nicads have been eclipsed by NiMH batteries.

    Are Li -ions even better than NiMH tho?
     
  9. Eeyore

    Eeyore Guest

    Define 'better'. What criteria are important to you ?

    Graham
     
  10. Guest


    Light weight and longer life, more torque maybe?

    Something you could use to build say a deck outside
    with...driving self tapping screws and such.

    I know that nicad wont be a good bet.... but unsure of
    NiMH or Li-ion units
     
  11. Eeyore

    Eeyore Guest

    You mean current delivery I suspect.

    I'd suggest you start here. Both have characteristics that may be more or less
    suitable than each other depending on the actual application.

    Note that NiMH battteries have a significant self-discharge rate that renders
    them unsuitable in applications that require a long 'standby' time. A couple of
    manufacturers have improved this recently with new NiMH chemistry but it's still
    a problem with most NiMHs.

    http://en.wikipedia.org/wiki/Lithium_ion_battery
    http://en.wikipedia.org/wiki/Nickel_metal_hydride_battery

    Graham
     
  12. Bob Adkins

    Bob Adkins Guest

    If Li batteries are so great, why do hybrid cars use NiCd's in their
    packs? Maybe because the Li cells are subject to catch fire?
    Anyone tried the Ryobi tools? They have a "1 battery fits all" scheme.

    I'm fed up with battery powered tools. There should be standards so
    that all 12v, 14v, 18v, 19v, etc. fit all power tools of the same
    voltage rating. If your drill breaks, you may have to throw away 2 or
    3 good battery packs. If your batteries die, you may have to throw
    away a perfectly good drill or saw because you can't find economical
    battery packs . Phooey on that. Also phooey on $85 battery packs. You
    can buy a decent drill with 2 batteries and a charger for $40.
    -

    Bob
     
  13. Eeyore

    Eeyore Guest

    Which cars use Nicads ?

    Graham
     
  14. Guest

    I'd hate to think how many deck screws my 10 year old 18 volt DeWalt cordless drill
    Maybe I should stick with NiCad after all then? What
    you think?
     
  15. Guest

    Anyone tried the Ryobi tools? They have a "1 battery fits all" scheme.

    Was wondering abt that brand/model as well.
     
  16. Part of the reason many carpenters use those big bucks to buy a compact
    generator or powersupply...some like Milwaukee,DeWalt,etc. have a radio_One
    generator fits all tools, not sorting thru a hundred pound stack of old
    batteries and chargers to find your ??? tool battery or charger.Same story
    on the temporary utility pole.....
    when it finally comes.
    Others gang battery the worktruck with an invertor and crank the truck every
    so often to charge the battery or run that heavy load from a masson saw or
    aircompressor.Diesel trucks (small diesel tractors are even better) do that
    fairly well.In recent years even seen some looking at gasifing the wood
    scraps at the job site .......to save on dumping fees and power the tools at
    the same time.
    And 110 ac tools will walk on battery tools with much more power to do the
    job. And never running out of power
    like batteries....well as long as you can keep it plugged into the ac outlet
    and generator running,at least.
    I need to take that back, a few cut the cord to a saw they were
    using.....maybe need to add watch the cord,too.
     
  17. Maybe the same reason as
    Bell,Aerospatiale/Eurocopter,Sikorsky,Westland,Agusta,and Hughes use them
    since the 50's and 60's.New design in and of itself ...is not good
    enorgh,since Ellison at the turn of the century invented nickol-iron (the
    first akaline,I think) batteries to improve his electric car range in the
    early 1900's.The Ford model T won out over the Ellison electric car in the
    end.
     
  18. Guest

    Part of the reason many carpenters use those big bucks to buy a compact
    You make a VERY compelling reason NOT to buy/use batter
    based tools

    You have me "rethinking" my idea abt doing so. Thanks
     
  19. Hybrids use NiMh not NiCd
     
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