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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: Battery-Backed Clock Goes Back
Message-ID: <8709031629.AA05422@cory.Berkeley.EDU>
Date: Thu, 3-Sep-87 12:29:55 EDT
Article-I.D.: cory.8709031629.AA05422
Posted: Thu Sep  3 12:29:55 1987
Date-Received: Sat, 5-Sep-87 10:55:13 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 25

:>> The battery should last "forever".  In other words, I want to see
:>> the battery trickle-charged by system power when the system is on.
:>The A501 board uses a ni-cad.  Of course you'll need an Amiga 500 to use it
:
:Ni-Cads will not last "forever" anyway.  Just sitting there being
:trickle charged wears them out.  It would be nice to know how long
:these will last.
:
:>							Even though
:>it's backing up 2K of static ram in addition to the clock that battery
:>should last somewhere in the range of 10-30 years
:>(="=)	bryce@hoser.berkeley.EDU -or- ucbvax!hoser!bryce
:
:I find this hard to believe.  Shelf life for Lithium batterys is about
:three years, and those are long life batteries.
:	Charles Brown	hplabs!hp-pcd!charles

	Me to.  10-30 years is wayyyy to long.  Internal eddie currents
inside batteries tend to put an upper limit on shelf life (3-8 years for
lithium batteries depending on the type of battery and average temperature
over the years).  Usually a lithium battery backing up a CMOS static ram
chip will last its shelf life as the static ram draws microamps when not
selected. 

				-Matt