In message <36B7FF40.CC358366@icon.co.za>, Quentin writes >Hi >I am using the Phillips PCF8583 I2C RTC/RAM. As I have to have power on >the RTC with main power off, I need a circuit for a battery backup with >charger (If I am going to use NiCad). > >This leads me to another question: Should I go NiCad or Lithium? >From a practical point fo view, NiCads fail more often than Lithium, most domestic equipment manufacturers that still use back-up batteries have now moved to Lithium instead. This includes Grundig VCR's, which often use a PCF8583 which is fed from the battery - they supply modification kits for the older VCR's to replace the NiCad with a Lithium. -- Nigel. /--------------------------------------------------------------\ | Nigel Goodwin | Internet : nigelg@lpilsley.demon.co.uk | | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | | Chesterfield | Official site for Shin Ki Ju Jitsu | | England | | \--------------------------------------------------------------/