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Can I swap a NiMH with NiCad?

Discussion in 'Troubleshooting and Repair' started by thundermasmacho, Jul 22, 2011.

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  1. thundermasmacho

    thundermasmacho

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    0
    Jul 22, 2011
    I have a cordless WaterPik (M/N WP-360) and it no-longer holds a charge. I have a number of questions:

    1. What's the easiest way to determine if it's the battery or the charger that has gone tits-up?

    2. It currently uses a 2.4V 1300mAh NiMH battery pack, but I can only find NiCad's with the same specs and dimensions (small enough to fit in the unit).
    So, can I replace an NiMH with a NiCad? I know that NiCad is kind of obsolete now, and comes with a whole host of other issues and concerns, but they seem to be pretty cheap and easy to find.
    2a. Anyone know of a good place to find a NiMH with these specs?
    2b. If I use a NiCad instead, is there a danger in overcharging, or a fire, etc.?
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    1. Can't say w/o detailed information about the product and your resources.
    2.Yes.
    2a. What spec's? I've seen 2.4V & 1300mAh but there's more to a battery spec' than that.
    2b. No. If the charger is intelligent it might just stop charging a little too early.
     
  3. thundermasmacho

    thundermasmacho

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    0
    Jul 22, 2011
    I don't have a lot of details on the battery or the device as I have long since lost the paperwork that came with it.

    However, here is the battery part number which may help:

    GP130AAHE2B1H

    Other info on the battery pack:

    NiMH Battery
    2.4V 1300mAh
    H9
    I guess you might call it a "2 AA Model" as it appears to be 2 AA batteries bound together.
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Ok, size AA is good info. I find the GP130AAHE cell datasheet but nothing on the assembled pack. Does it have solder flanges attached, and how are they configured?
     
  5. thundermasmacho

    thundermasmacho

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    Jul 22, 2011
    [​IMG]
    [​IMG]
     
  6. shrtrnd

    shrtrnd

    3,767
    487
    Jan 15, 2010
    Your charging circuit is for NiMH, I wouldn't swap NiCads for it, because the charging
    circuit parameters are different. The only reason you can't find 1300mAh NiMH's, is
    because they have considerably higher capacities these days. You can use any NiMH,
    that has a higher amp/hour capacity. If you're in the U.S., get the batteries from
    All Electronics Corp in Van Nyes, CA, ....or any other elec supply shop. This is any
    easy fix, you just need the right batteries or battery 'pack' (of two), that is readily
    available from many places.
     
  7. thundermasmacho

    thundermasmacho

    5
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    Jul 22, 2011
    Brilliant!! Thank you so much.

    I have a couple more questions for you then:

    1. Just to clarify, 1300mAh means 1300 miliamps/hour correct?
    2. Does the voltage make a difference then? Higher? Lower? Or should I definitely find one that is 2.4V?

    Thanks again for all of your help.

    Cheers,

    -KS
     
  8. TBennettcc

    TBennettcc

    292
    2
    Dec 4, 2010
    1300mAh means 1300 milliamp-hours. Which means it can supply a current of 1.3 amps (1300 milliamps) for one hour. Or 2.6 amps for 30 minutes (at least on paper). In real life, these things vary.

    Rechargeable battery cells are usually 1.2v, hence, two in series give you 2.4v. It shouldn't be hard to find a 2.4v battery pack.
     
  9. thundermasmacho

    thundermasmacho

    5
    0
    Jul 22, 2011
    Thanks Tim, a really do appreciate it; my teeth and gums also thank you.

    If you'd like to learn more about being a drunkard who lives in Portland, then please tune into Funemploymnet Radio: http://funemploymentradio.com/

    Cheers,

    -Kenny
     
  10. shrtrnd

    shrtrnd

    3,767
    487
    Jan 15, 2010
    Like TBennettcc said, both NiCads and NiMH cells are typically designed for 1.2v.
    The reason your battery pack is composed of two cells, is to reach the 2.4V needed
    for your device. These days you're going to find replacement batteries at or above
    2400mA/Hr. All that means, is your between-charge times will be less, because of
    higher Amp Hour capacity of the newer batteries.
     
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