NI-CD,battery level monitor

[hm_fa_da]

hi ;

i am using 8* 1.2 V NI-CD chargable battery , i want to monitor battery level on LCD , i am using an ADC to convert battery voltage to digital , now i want to know what range of voltage is recommanded and standard for these four levels :
1=high
2=good
3=low
4=too low
for example 10.5V-11V is high , 10V-10.5 is good and ... ( just example , i need to know the standard voltage range )

thanks ,
hm_fa_da

 

[pisoiu]

You can consider 1,4-1,5 v/cell as fully charged, 1,2v/cell as a good value, 1,05-1,1v/cell as low and at 1,0v/cell or under, you should shut down your circuits.

/pisoiu

 

[tryagain]

Ti have special NI_CD charge controling chip ,it have more application note is very useful for you

 

[s_a_r_a]

I'm agree with pisoiu.
The nominal voltage of the single cell is 1.2V but depending on what kind
of charging method you use this voltage can rech the value of 1.4-1.5V.
You should control that the voltage of the battery pack doesn't fall under 1V per cell.
For example you could indicate a "LOW BATTERY" message when the voltage is 1,05-1,1v/cell and than power off your instrument after some minutes if your system has an Auto Power Off System.

Best Regard