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Battery charging time question.

Discussion in 'Hobby Electronics' started by justlookin, Mar 22, 2007.

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  1. justlookin

    justlookin Guest

    Hi Group, wondering if anyone can give me an idea if i'm on the right track
    for a charging time on a handheld radio battery.
    It's a kenwood copy and the "fast" charger cradle says 14.5v input at
    800ma and it lists the output at 9.4v at 850ma both DC. The battery is a
    NiMh at 1500mah at 7.2v. Now the interesting part is that the supplied
    plug pack does not meet the input listed on the cradle, it is 12v dc at
    300ma, so i take it if the plug pack was up to spec the fast charge time
    would be just under 2 hours, but with the supplied plug pack at 300ma i
    would be looking at around 5 hours to charge ??
    Thanks for any help !
  2. Phil Allison

    Phil Allison Guest


    ** Far too many unknowns in your story.

    Just try it out and see how long it takes.

    ....... Phil
  3. Allan

    Allan Guest

    I think you may have a problem, if the charger cradle says 800 ma then the
    12v 300 ma will be to small, and may fail.
    Also the lower voltage MAY mean you wont get a full charge, but that's going
    to depend on the type of charging circuit it has.
    I would be tiring to get a 14.5 volt Power supply with a current rating of
    at least 850 ma.
    If you have a DMM take some measurements and see how much current it does
    draw when charging a flat battery..
  4. justlookin

    justlookin Guest

    Thanks Allan,
    I had a quick look with the multimeter at the contact
    points on the cradle with the plug pack attached but no radio in the cradle,
    it's sitting over 22volts and the same straight on the plug of the pug pack,
    so i guess t's fair to say it's unregulated ! When i get a chance i'll have
    a look inside the cradle and see whats there, i've done a google on this
    type of radio and theres been a bit of discussion about them in the uk with
    a lot of them being fakes, the cradle led is supposed to go red for charging
    and green when complete, but one person said their led was only 2 pins not
    3. Anyway, i bought the unit with low expectations as it was from HK, i just
    mainly want to not over charge it, I gave it about 5.5 hours on friday and
    the radio does and has worked well on 5 watts, but i think a regulated pack
    would be a definite !
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