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newbee - Battery question

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Newbee26

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Hi !

I know than i can/must measure battery by aH and thru resistor but what i really what to know (tom jones part :)) is how to measure the CORRECT amperage power of the battery.

Basicly i can connect my multimeter directly to 9V battery and make power measurments but im risking the multimeter if i do the same with 12v or higher.

So, how to correctly measure the power output (amper) of some battery?

N26

p.s. be so kind and draw some simple schematics so i can use this without additional questions :).
 

Thnx blastronics for your replay (btw. nice logo :) )!
I saw the pdf and they are writting all possible regarding this battery.

The pdf is ok but i need some "basic" approach becuse i need to find correct:

1.) voltage
2.) amperage
3.) capasity

So basicly, if i connect multimeter directly to battery i get 1,1V and 7mA.

Questions :
I know that this are not correct values so i need some tested simple schematics on which points can/schould i make measurments to get correct values and to see how to define the real capasity of the battery...

I will use this approach then in other cases, with stronger battery's.

Thank you in advance for your time !
 

u cannot measure the full strength of the battery....but it is rather assumed......try searching it in www.discovercircuits.com........(click on the list of schematics in the home page)
 

Go to www.maxim-ic.com and search for 'fuel gauge'. They (and others like Nat'l Semi, TI and Intersil) all have a number of white papers on how to determine the remaining capacity of a Lithium battery. And it is VERY difficult. For Lithium type batteries for example, it is impossible to tell with a voltmeter. The voltage varies with temperature, load, etc. And the worst part is that the voltage remains very constant for about 90% of the life of the battery and then suddenly drops off. You basically need an integrating discharge calculator along with a temperature sensor and setup parameters for your battery type.
If you have a Carbon-Zinc battery, you might be able to do it by just measuring the voltage and temperature.
 

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