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BATTERY LIFE?

iskor12

iskor12

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How do you calculate approximate battery life?
I will be using one cr123 battery with a laser that will be eating up about 250mA. Is there a way to estimate my total run time?

THanks :)
 





M

milantheone

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imagine that you have 2500maH battery.. it means that battery is able to produce
2500ma for one hour
or
250ma for  10 hours
or
25  ma for   100 hours
however it is just theoretically..it is not so linear as it depends on battery's chemical reactions..
but in normal range of use you can approximately estimate a time how long will battery last..

so if your cr123 battery is 800mah it could last approximately 3-3,5 hours under 250mA load..

correct me anyone if i am wrong..
 
lasersbee

lasersbee

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MilanTheOne said:
imagine that you have 2500maH battery.. it means that battery is able to produce
2500ma for one hour
or
250ma for  10 hours
or
25  ma for   100 hours
however it is just theoretically..it is not so linear as it depends on battery's chemical reactions..
but in normal range of use  you can approximately estimate a time how long will battery last..

so if your cr123 battery is 800mah it could last approximately 3-3,5 hours under 250mA load..

correct me anyone if i am wrong..
Click to expand...

Nice explanation.... Well done... :)

Jerry
 
M

milantheone

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lasersbee said:
[quote author=MilanTheOne link=1233074977/0#1 date=1233079992]imagine that you have 2500maH battery.. it means that battery is able to produce
2500ma for one hour
or
250ma for  10 hours
or
25  ma for   100 hours
however it is just theoretically..it is not so linear as it depends on battery's chemical reactions..
but in normal range of use  you can approximately estimate a time how long will battery last..

so if your cr123 battery is 800mah it could last approximately 3-3,5 hours under 250mA load..

correct me anyone if i am wrong..
Click to expand...

Nice explanation.... Well done... :)

Jerry[/quote]

:eek:
cheers mate, i highly appreciate your honour.. ;)
 
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phoenix3200

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The battery type vs. the discharge rate also makes a huge difference. Under heavy loads (which covers about any laser that comes from here), an alkaline battery has a severe drop in life, e.g. you might only get 2-300 mAh out of that 800 mAh battery if it's an alkaline. If it's a NiMH or a lithium, they can support much higher battery drains without as great of a loss in capacity (80-90%).
 
iskor12

iskor12

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phoenix3200 said:
The battery type vs. the discharge rate also makes a huge difference.  Under heavy loads (which covers about any laser that comes from here), an alkaline battery has a severe drop in life, e.g. you might only get 2-300 mAh out of that 800 mAh battery if it's an alkaline.  If it's a NiMH or a lithium, they can support much higher battery drains without as great of a loss in capacity (80-90%).
Click to expand...

Interesting. I didn't know that.
 
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phoenix3200

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One thing I forgot to mention was that my example related to a AA, but should still hold for thicker batteries, just nowhere near as badly.  A 123 or a CR2 is designed to handle a higher current load than a AA, which is designed for a higher load than a  AAA.  So it won't be as bad as I said in the case of a 123.
 
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