battery capacity chart

[USACelt]

Is there one source for battery charge capacity charts.
I have seen charts for c123 and 18650 I think. But I want to find charts listing the capacity on other sizes such as AA, AAA, D's, ect.
I Have tried searching, but have found only references on how to measure them. Maybe there is a formula for figuring this, volts = percentage of battery life. Thanks

 

[Ragiska]

most chemistries have no such relation.

 

[USACelt]

I have one chart, I think it was for an 18650.

4.2v = 100%
4.1v = 87%
4.0v = 75%
3.9v = 55%
3.8v = 30%
3.5v = 0%

Now I want the same thing for the other batteries. Maybe it isn't practical to try and measure smaller batteries like that ?
:shrug:

 

[Ragiska]

i think you are confusing battery sizes with chemistries. li-co cells are just about the only popular chemistry you have such a relation for.

 

[NutSAK]

As Ragiska is explaining, you cannot estimate the remaining capacity of an alkaline battery with unloaded cell voltage as you can with Li-Ion batteries. That 18650 chart will work with any Li-Ion battery, not just the 18650 size.

 

[45/70]

......That 18650 chart will work with any Li-Ion battery, not just the 18650 size.

It will work for LiCo (lithium cobalt oxide) Li-Ion cells, but not for LiFe (lithium iron phosphate) Li-Ion cells. I'm not sure about some of the other Li-Ion chemistries, but I think it also works with LiMn (lithium manganese oxide).

Confused yet?

And no, the table (or similar table) will not work for nickel, alkaline, or carbon based cells. Their chemistry is different, and there is no way to determine remaining capacity by measuring voltage alone.

Dave

 

[NutSAK]

It will work for LiCo (lithium cobalt oxide) Li-Ion cells, but not for LiFe (lithium iron phosphate) Li-Ion cells. I'm not sure about some of the other Li-Ion chemistries, but I think it also works with LiMn (lithium manganese oxide).

Yes, of course. I should have specified. Thanks Dave.

 

[USACelt]

Do I understand ? no
But I do appreciate people trying to help.
Thanks

 

[Mr Happy]

Do I understand ? no
But I do appreciate people trying to help.
Thanks

For example: Two NiMH batteries. Both could have the same voltage, but the remaining capacity in each battery could be completely different. Therefore you can't tell the remaining capacity just by measuring the voltage.

 

[SilverFox]

Hello USACelt,

Perhaps this will illustrate the point...

Using the same measurement technique that is used with the 18650 cells, with NiMh and NiCd cells you have

1.50v = hot off the charger at 100%
1.35v = 100%
1.25v = 95%
1.24v = 90%
1.23v = 85%
1.23v = 75%
1.23v = 60%
1.23v = 50%
1.23v = 30%
1.23v = 0%

Tom