Ni-Cd Vs Li-Ion

Discussion in 'General Electronics Chat' started by dileepchacko, Dec 8, 2008.

  1. dileepchacko

    Thread Starter Active Member

    May 13, 2008
    102
    1
    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.
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,676
    899
    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
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    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.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    I can't speak for the Sanyo batteries, but Forte lists their CR2 at 0.75AH.
     
  5. dileepchacko

    Thread Starter Active Member

    May 13, 2008
    102
    1
    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?
     
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