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  1. #1
    Senior Member russiankdi's Avatar
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    Battery question

    I took an old bike light, put a switch in, and ran a battery pack as the power source. The pack contains 4 regular AA batteries. What do you think is the life span of the batteries if the bulb takes 6 volts?
    1978 Schwinn Varsity Single Speed

  2. #2
    Senior Member Michigander's Avatar
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    Depends on how many amps the bulb draws. For a ball park guess, it should be at least an hour or so I'd say.
    Bring back the Sig Test!


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  3. #3
    I play in the street. nobrainer440's Avatar
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    As michigander pointed out, it depends on the amperage of the bulb. Divide the wattage of the bulb by the voltage (6V) to get the amperage. Divide the battery capacity (in amp-hours) by the amperage, and voila! Run time in hours! As a rough estimate, the capacity of an alkaline AA might be around 1 or 2 amp-hours. Note: The capacities do not add up, as all the current flows through all the batteries at the same time.

    Also, AA's are actually rated at 20 milliamps for 107 hours. Since your current will likely be much greater than this, the batteries will probably not perform ideally. Hopefully they will not get super hot.

  4. #4
    Senior Member russiankdi's Avatar
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    Well the bulb is 2 watts. So in amps i got .3 repeating. So i should be able to get about hours out of it, which is enough.
    1978 Schwinn Varsity Single Speed

  5. #5
    Senior Member Michigander's Avatar
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    One thing worthy of suggestion is rechargable NIMH AA's. They last long as hell in my camera.
    Bring back the Sig Test!


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  6. #6
    Senior Member russiankdi's Avatar
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    Quote Originally Posted by Michigander View Post
    One thing worthy of suggestion is rechargable NIMH AA's. They last long as hell in my camera.
    I have those too, but recharging them is a problem. The battery pack is directly soldered to the light, with the exception of the positive wire, it runs into a switch.
    1978 Schwinn Varsity Single Speed

  7. #7
    Mmmmm potatoes idcruiserman's Avatar
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    Depends if the batteries are in series or parallel.
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  8. #8
    I play in the street. nobrainer440's Avatar
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    Quote Originally Posted by idcruiserman View Post
    Depends if the batteries are in series or parallel.
    Series is assumed.

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