Discharge of a D cell Nicd ?

[treez]

If a D cell Nicd has discharged down to 1V.....then from that point, how long does it take for 22uA discharge current to discharge that cell down to 0.8V?

 

[tpetar]

What capacity of battery and what exact manufacturer and battery model ?

D is size of battery and not capacity, and cant tell us exact capacity. Can be 2Ah, 3Ah, 5Ah,....

Try to get datasheet and discharge graph for that battery.


Best regards,
Peter

;-)

 

[treez]

this is the battery

**broken link removed**

its 4Ah

 

[tpetar]

I think you will have bigger problem with self discharge on longer period.

They give short datasheet informations. Also I didnt find self discharge information data in datasheet.

For sure you need to do some own lab tests.

You can apply general NiCd self discharge values for 10-15% per month at 20C and 20% on higher temperatures + your load of 22uA.



Best regards,
Peter

 

[BradtheRad]

The discharge curve makes a sharp downward turn at 1.1 V. It becomes 10 or 20 or 30 times more rapid.

To get an idea of a 22 uA drain at that point, you could say it is like a 440 uA drain in the range above 1.1 V.