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Old 09-11-07, 06:52 PM   #1
russiankdi
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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?
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Old 09-11-07, 07:50 PM   #2
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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.
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Old 09-11-07, 08:19 PM   #3
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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.
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Old 09-11-07, 08:30 PM   #4
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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.
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Old 09-11-07, 09:04 PM   #5
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One thing worthy of suggestion is rechargable NIMH AA's. They last long as hell in my camera.
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Old 09-11-07, 09:17 PM   #6
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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.
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Old 09-12-07, 12:44 PM   #7
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Depends if the batteries are in series or parallel.
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Old 09-12-07, 01:30 PM   #8
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Depends if the batteries are in series or parallel.
Series is assumed.
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