Hi all

What is the basic difference between Ni-Cd and Li-Ion rechargeable battery. Which is suitable for RTC (DS3232) backup. What is the amps hour of a CR2 Li-Ion sanyo battery.

 

NiCd batteries have a fairly high self-discharge rate; Li-ion do not. Therefore, for a back up, I would favor the Li-ion.

John

 

The capacity of the lithium CR2 battery is not on the internet.
It is small and light so it won't have much capacity.

Its voltage is completely different to an old Ni-Cad battery.

 

I can't speak for the Sanyo batteries, but Forte lists their CR2 at 0.75AH.

 

Dear All

Why all RTC is running low frequency crystal. Why not higher frequency?. Is there any consideration for accuracy in higher frequency. If a RTC is running on 32.768kHz in its normal operation what is the tolarence level? and If i implement an internal RTC on a MCU which is running 25Mhz main clock, what is the tolarence level? which one is more accurate?