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Discussion in 'Electronic Basics' started by Bumble, Dec 11, 2004.

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  1. Bumble

    Bumble Guest

    if I conect 2 1.5 volt batteries together, does this mean i have 3 volts or
    a stronger 1.5 charge?

    Is this the same for amps? Do the amps double as well?
  2. Tom Biasi

    Tom Biasi Guest

    It depends on how you connect them together.
    Tip to tail (series) add the voltage, same current.
    Tip to tip,tail to tail (parallel) add the current capacity same voltage.
    (unless the capacities are not really close to each other.) Don't do
    parallel if the batteries are not the same voltage.
  3. CFoley1064

    CFoley1064 Guest

    Subject: batteries

    Series Parallel

    .------o + .------o-------o +
    | | |
    +| | |
    1.5V --- | |
    - +| +|
    | 3V 1.5V ---1.5V--- 1.5V
    +| - -
    1.5V --- | |
    - | |
    | | |
    '------o '------o-------o
    created by Andy´s ASCII-Circuit v1.24.140803 Beta

    The first connection is called a series connection. It produces 3V with two
    1.5V batteries, and is perfectly OK. A connection of this type provides twice
    the voltage at the same mA-H (milliamp-hour) rating as one battery. That's
    twice the total power (P = V * A)

    The second connection is parallel, and _may_ work out OK, depending. Usually,
    hooking up battery cells in parallel is a bad idea. Most batteries have small
    differences in potential due to age, usage, and the manufacturing process.
    Since connecting them together means that they will have to have the same
    potential, usually one of the batteries ends up partially discharging into the
    other, slightly lower voltage battery, which wastes power. This occurs until
    the voltages equalize. That doesn't do the lower voltage battery any good
    either, especially if it's not the rechargeable type. Even the rechargeables
    can be harmed by a momentary charging current greater than the recommended

    If both batteries are new, and come out of the same package, it's usually OK.
    If one of them is new and one is mostly discharged, both batteries get hot, and
    you end up with two mostly discharged batteries.

    Theoretically, putting two batteries in parallel will give you the same voltage
    as one, with twice the total mA-H (milliamps * hours to discharge). Same
    voltage at twice the current = twice the power (P = V * A). But if you need
    twice the power at the same voltage, it's usually a better idea to buy a bigger
    battery (say, "D" instead of "C").

    Good luck
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