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02-05-2009, 03:02 AM #1
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Townes
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Battery Life Comparison

What lasts longer- 2xAAA alkaline batteries or 3xSR44 button cells? And by how much?

02-05-2009, 03:06 AM #2
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potatorage
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Re: Battery Life Comparison

AAA alkalines are 1250mA if I can remember correctly, while button cells are sig. less

02-05-2009, 03:07 AM #3
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potatorage
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Re: Battery Life Comparison

SR44's give about 200mAh, google helps a lot with these questions :

02-05-2009, 03:23 AM #4
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Townes
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Re: Battery Life Comparison

hmm....
Quote:
 google helps a lot with these questions *:
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 Make money by using Google Search!

Thanks for the info. How do you calculate battery life from capacity &amp; laser power? Do you use that P=IV formula?

02-05-2009, 11:55 PM #5
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Illuminum3415
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Re: Battery Life Comparison

for example: if my laser draws 530ma from the batteries, and the battery's capacity is 700 mah, then my runtime would be 700/530 = 1.32 hours, which equates to 1h + [0.32x60]m or 1 hour 24 minutes

I don't believe the laser's power has a direct relationship with battery life since theres a middle man called the &quot;driver circuit.&quot; I could be wrong though :-/

02-06-2009, 12:05 AM #6
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Gazoo
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Re: Battery Life Comparison

That doesn't work because of the way battery companies determine their capacity. The more current you draw from an alkaline battery the less capacity it has. Go to energizer and look at the graphs. NIMH batteries hold up much better. And eneloops are the bomb... ;D

02-07-2009, 08:05 PM #7
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Illuminum3415
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Re: Battery Life Comparison

oops, been playing with lithiums for so long I forgot all about voltage sag on Alkalines. :-?

well said Gazoo

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