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NiCad Battery Question

Discussion in 'Electronic Repair' started by Lou, Jun 20, 2007.

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  1. Lou

    Lou Guest

    I have an outdoor garden solar powered decoration that uses a small
    solar panel and that charges a Ni-Cad AA Rechargeable Battery. The
    battery needs replacing and it is an AA 1.2v at 600mAh. I looked at
    Target, Walmart, and another store and yes, they all have the AA
    Rechargeable Batteries but with like a 1000mAh rating. I do not know if
    I need to stick to the 600mAh rating or can I use the 1000mAh rated
    rechargeable battery? This decorative device is just a fiber optic
    display in a gazing globe so the battery powers a bulb for the fiber
    optics at night.

    Thanks in advance for any assistance.

    Lou
     
  2. Ken Weitzel

    Ken Weitzel Guest

    Hi Lou...

    Go ahead and use the larger capacity; it will make virtually no
    difference, but if dollars mean much to you...

    Last summer in our Walmart (Winnipeg, Canada) they had the smaller
    capacity nicd's at a price that was almost a give-a-way. (pkg of 4
    for only two or three dollars). The trick was that they weren't in
    the places that you'd normally expect to find batteries, but were
    rather hanging on the wall in the garden supplies department

    Take care.

    Ken
     
  3. Eeyore

    Eeyore Guest

    Agreed. It certainly won't harm anything.

    It's really difficult to find those low capacity batteries any more.

    NiMH AAs are up to 2700-2800 mAh now if you go for the latest hi-spec ones.

    Graham
     
  4. It doesn't pose a problem to use a higher mah hour rating, in fact it
    will run longer. I just got a new solar pool lamp, and the instructions
    for it say as much. Additionally mine says to charge for two days before
    using to get the battery fully charged. What this means is that I have
    to bring it in at night and put under a lamp so that it doesn't run all
    night. I would expect that if I put a battery with twice the capacity, I
    probably should charge for 4 days .
    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
  5. UCLAN

    UCLAN Guest

    Simply charge it first in an external charger. Problem solved.
     
  6. Ron(UK)

    Ron(UK) Guest

    Some of my cheapo garden lights batteries failed, and as an experiment I
    just popped in normal AA duracells. That was last summer and they are
    still working fine. And yes, before you flame me (groan)they are in a
    place where an explosion of fire wouldn`t be a problem. They stay lit
    all night on an afternoons sunlight charge.


    Ron(UK)
     
  7. Eeyore

    Eeyore Guest

    You can actually get 'rechargable alkaline' types I believe but I expect the
    wide availability of cheap Nicad and NiMH means they never took off.

    Graham
     
  8. According to Which? tests they performed badly especially if heavily
    discharged. Only possible benefit I could see was the nominal 1.5 volts
    per cell.
     
  9. Guest

    ignore it, just put it out and it'll run fine. There is some bizarre
    advice about in instruction leaflets on this for some reason. Maybe an
    exercise in reducing successful guarantee claims.


    NT
     
  10. I've never understood this long charge with new batteries. Ages ago I
    bought a PPPro cordless drill with a crude fast charger (4 hours) which
    reckoned you doubled that for the first one before using. Which I'd say
    would fry them, as they arrived with near a full charge anyway by the
    lights on the side of the battery.
     
  11. me

    me Guest

    Some batteries are not shipped formed (charged). The solar lights are NOT
    fast chargers...
     
  12. budgie

    budgie Guest

    It's an old scheme to attempt some form of SOC equalisation in series strings.
    Fine for C/10 but a bit extreme for fast chargers.
     
  13. Guest

     
  14. I've yet to come across a power tool recently supplied with totally
    uncharged batteries. It may have been the case once.
    Didn't say they were. Just expanding a point which was brought up.
     
  15. Ian Jackson

    Ian Jackson Guest

    As already suggested, do the initial charge with your normal NiCd/NiMH
    charger. For several days, the solar lights will probably still be lit
    at dawn the next morning! Also, once in a while, it won't do any harm to
    repeat this exercise, and especially if you 'lay them up' for the
    winter.
    Ian.
    --
     
  16. budgie

    budgie Guest

     
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