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Eliminateing battery in circuit

Discussion in 'Electronic Basics' started by Jack B. Pollack, Nov 9, 2003.

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  1. I have a portable device with a rechargeable battery. The battery is dead
    and I want to AC transformer power the device. I cant find a spec on the
    battery online (an it is not on the battery). The charger contacts on the
    'base' are putting out 5V.

    If I want to eliminate the battery, do you think I can bypass the charging
    contacts on the portable unit and just feed 5V in directly from a regulated
    supply instead of the battery?

    Do you think the original battery could charge at 5V, but supply less
    voltage to the actual circuit (NI-CD battery)?

  2. <snip>

    Assuming that this is a NiCd batter, you need only break open the
    pack itself, and count the individual cells. Multiply the number of
    cells by 1.2, and that will give you the operating voltage of the

    From there, it should be a simple matter to select an appropriate
    power supply.

    Dr. Anton Squeegee, Director, Dutch Surrealist Plumbing Institute
    (Known to some as Bruce Lane, KC7GR)
    kyrrin a/t bluefeathertech d-o=t c&o&m
    Motorola Radio Programming & Service Available -
    "Quando Omni Flunkus Moritati" (Red Green)
  3. I cut off the plastic wrap. There is only 1 (mushroom shaped - wider on top)
    cell inside. The cell is about the diameter of a quarter and about 4 or 5
    quarters high.

    The device is a wireless IR headphone. Do you think the entire IR receiver
    and amp are driven off of 1.2V?

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