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Battery configuaration - series vs parallel

Discussion in 'Power Electronics' started by cpagan5, Feb 14, 2013.

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  1. cpagan5


    Feb 9, 2013
    Hi All,

    I have a question regarding battery capacity. I have a 1.5V motor that pulls 150 mA. Is there ant difference in the battery life if I run 4 AA batteries in parallel or if I put them in series (6V) and use a buck converter to adjust the voltage to 1.5 V.

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    In a perfect world there is no difference initially, however in the real world the buck converter is not 100% efficient, so the batteries will drain a little faster.

    The advantage to the buck regulator is that when the battery voltage begins to fall, the output will remain at 1.5V, so the motor will see a constant voltage for the entire life of the batteries.
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