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Thread: How long will a 9V batt last for 0.07A useage?

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    How long will a 9V batt last for 0.07A useage?

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    Is there any way to estimate or calculate how long a 9V battery will last when it's attached to a device that runs 24/7 on a 12V 0.07A rating?

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    these 9v batteries have a typical capacity of 550-500mah.
    when supplying 0.07a, the battery will last only 8.5 hours.

    and 9v battery not be able to operate a 12v device.
    thomas liew

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    i personally won't even consider it, if it's drawing current at 70 milliamps, your Duracell battery probably won't last a day. Too costly to do so and it's a hassle having to change it frequently. Use AD/DC adaptor lah

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    Darn!

    Thomas (Liew), the device I'm talking about is a DC fan, and primitive testing by touching the contacts of the battery on the bare wires of the fan has yielding movement, only at a slower spin rate. Of course this is not true for other devices.

    I guess there goes my plan. I want to setup a slow-circulating fan in my terrarium where air circulation is poor, but the power point is just too far away.

    Thanks though!

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    Terrence, forget the idea of using battery to power a fan.
    use a ac/dc adaptor for the fan.

    you can use an extension cable to bring power to your terrarium. get those ac/dc adaptor with variable output voltages. adjust the output voltage to control the fan speed.
    thomas liew

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    That's what I hate... wires . I want to keep my balcony neat.

    Well.. short of getting a electrician to wire up a new power point.. nothing much I can do.

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    Quote Originally Posted by |squee|
    Well.. short of getting a electrician to wire up a new power point.. nothing much I can do.
    Put a hamster cage next to it and get the hamster's training wheel connected to a simple fan?

    Cheers,
    I have dwarf cichlids in my tanks! Do you?

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    But I need a transformer for kinetic to electrical energy

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    Quote Originally Posted by |squee|
    But I need a transformer for kinetic to electrical energy
    solar energy?
    Cheers and Regards,
    Billy Cheong

    I'm not always dumb,
    Just most of the time...

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    Solar panel super expensive leh. Unless I figure out a way to rip the solar panel off a old calculator

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