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radio eats batteries

Discussion in 'Electronic Basics' started by RichD, May 6, 2008.

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  1. RichD

    RichD Guest

    I purchased an armband radio recently, for jogging.
    Truetech, if that means anything.

    I inserted 2 new alkaline AAA batteries, they
    are now dead after about 90 minutes use.
    Is that normal? I can still return the radio,
    if it's presumed defective.

    What is the capacity of a AAA battery?

    Also, this is the first time I've tried earbud style
    earphones. The damn things won't stay in my ears!
    Are there different sizes? I figure it's 'one size fits all'.
    Maybe my ear canals are too narrow.... (also
    my ears are too big, but that's another story)

    They have the foam pads, which are pretty large,
    and overflow out the ear canal - they don't squeeze
    in completely.
  2. Phil Allison

    Phil Allison Guest


    ** What does the maker's spec sheet say ?

    Have you ask the dealer what is the normal running time?

    You dumb question is more suited to some consumer whinger's forum.

    ...... Phil
  3. Sounds very low, but depends entirely on the device.
    Does it have any specs?
    Is this it:?

    If that's the case then the LED light will take some extra juice to run. But
    it could just be badly designed, wouldn't be the first time for such a
    For Alkaline, anywhere from about 1200mAh down to under 500mAh depending
    upon the current drain.
    So if your device was designed properly, it would be draining say 300-400mA
    from the batteries to last that long. That is very high for such a device.
    So either you got some dud cells, the device is faulty, or it's badly
    designed. Perhaps even a combination of all three.
    Looks like it uses a standard 3.5mm jack, in that case you can use any
    headphones on the market.

  4. Guest

    Hi there,
    One reason could be a leaky decoupling capacitor across the main
    supply rails.
    Was the battery incorrectly connected? Components today seem to have
    tolerance to abuse due to constraints on size minaturisation and costs.
  5. RichD

    RichD Guest

    From the user's manual:
    output power: 10 mW
    yep, it came from Target:
    Trutech T50-A
    hmmmm... 10 mW at 3 V = 3mA .......
    so the internal dissipation is 100x the load power...
    I replaced the batteries, and I'll track their life.

    Or the individual unit is defective, or the
    manufacturer is an ass.
  6. RichD

    RichD Guest

    Ask the dealer, good one, Philster,
    hahaha!!! It's Target - staffed by highly
    trained audio electronics professionals!
    I figured this group includes some
    experienced circuit designers, who
    might estimate the expected power
    burn on a portable FM radio.

    But please, direct me to one of these
    whinger's forums, of which you are so
    familiar, Phil old buddy, and I shall
    proceed thence forthwith.
  7. Phil Allison

    Phil Allison Guest

    "RichDickead "
    "Phil Allison"

    ** No expertise is needed to say how long something runs on set of
    tteries - fuckhead.

    ** Totally irrelevant to your problem - fuckhead.

    ** Use Google - you asshole.

    ...... Phil
  8. sparky

    sparky Guest

    Your ignorant answer is a very typical leftist response to a valid
  9. Phil Allison

    Phil Allison Guest

    "sparky" <>

    ** Go drop dead -

    you vile autistic, ADHD fucked pile of dog shit.
  10. neon


    Oct 21, 2006
    don't worry about the radio worry about how good were the batteries as installed. the major power usage is in soeakers or phones.
  11. Dave

    Dave Guest

    I would say that it's EXTREMELY RARE that I agree with Phil's caustic
    replies to a post, but this is one of those times.

    So, you bought a complete piece of shite at Target and you actually expect
    something of it? What did you spend, maybe $10? Sorry to resort to
    profanity, but IT'S A PIECE OF FUCKING TRASH, made in China, it probably
    cost $0.50 to manufacture and another $0.10 to ship to the good ol' USA
    where discerning buyers like yourself can't help but buy it. Either it's a
    bad design, or it's poor construction but either way it eats batteries.

    Throw it out and go buy a Sony or some other brand you've heard of.

    As far as the earbuds go, how would you expect your feet to feel after you
    run a marathon in some "Avidas" or "New Valance" Chinese knock-off running
    shoes you bought at Target for $18? It costs MONEY to DESIGN earbuds which
    are ergonomically correct. These shit-factories in China use the following
    design process: they see a pair of expensive Sony earbuds through the
    display case glass, perhaps going so far as to take a blurry picture of them
    with their camera phone, then rush back to the factory and tell their
    designer "Make headphone. Rook rike ris. Quick quick."
  12. z

    z Guest

    on the one hand, it's probably harder to design a radio which actually
    operates but also discharges batteries overly rapidly than one that
    just works normally.

    on the same hand, there is an implied warranty of usability when
    target sells you something, and it could well be argued that 90
    minutes for a set of batteries breaches that warranty.

    on a related hand, the stupid foam-cushion earbuds for my motorola
    phone which cost substantially more than $10 (just the earbuds, never
    mind the phone) also don't stay in my ears; i can't figure out whose
    ears these things are supposed to fit. do japanese people have
    unusually shaped and sized ear canals? i'm seriously thinking of
    ductaping them on every day. and they are the only ones available
    which connect to motorola's mini-usb output.

    so to sum up, "whaddya expect from target you get what you pay for" is
    overly simple in this case.
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