On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote: I was told that leaving it plugged in and just shutting off the power switch would save batteries. Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed).
Re: Battery Difference between CR2032 and CR2025
Started by ●September 3, 2012
Reply by ●September 11, 20122012-09-11
Reply by ●September 11, 20122012-09-11
westom1@gmail.com wrote:> > On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote: > I was told that leaving it plugged in and just shutting off the power switch would save batteries. > > Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed).Bullshit. The computers RTC isn't static, it consumes some power at all times. When the computer isn't supplying the power, the battery is. It isn't much, but it will cut the battery life by half. The RTC uses the same 32,768 hz crystal used in a digital watch, and the same divider chain to generate the 1 PPS, followed by additional dividers to track time & date. it also has additional registers to store BIOS settings. No CMOS circuit is perfect. All gates leak small amounts of current, and the more a chip has, the more it consumes due to leakage.
Reply by ●September 11, 20122012-09-11
On 11 Sep., 17:16, "Michael A. Terrell" <mike.terr...@earthlink.net> wrote:> west...@gmail.com wrote: > > > On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote: > > =A0I was told that leaving it plugged in and just shutting off the powe=r switch would save batteries.> > > Battery life expectancy is determined by 'shelf life'. Typically five y=ears. =A0The battery will discharge just as quickly on a shelf or in that c= omputer (assuming an IC that contains the CMOS was properly constructed).> > =A0 =A0Bullshit. =A0The computers RTC isn't static, it consumes some powe=r at> all times. =A0When the computer isn't supplying the power, the battery > is. =A0It isn't much, but it will cut the battery life by half. The RTC > uses the same 32,768 hz crystal used in a digital watch, and the same > divider chain to generate the 1 PPS, followed by additional dividers to > track time & date. =A0it also has additional registers to store BIOS > settings. =A0No CMOS circuit is perfect. =A0All gates leak small amounts =of> current, and the more a chip has, the more it consumes due to leakage.but it isn't much for something specially made for low current I just picked the first maxim rtc on their list http://datasheets.maximintegrated.com/en/ds/DS1339A.pdf something like 0.5uA looking at this: http://www.sony.net/Products/MicroBattery/cr/spec.html it doesn't seem to make much of a difference for a cr2025/cr2032 -Lasse
Reply by ●September 11, 20122012-09-11
"langwadt@fonz.dk" wrote:> > On 11 Sep., 17:16, "Michael A. Terrell" <mike.terr...@earthlink.net> > wrote: > > west...@gmail.com wrote: > > > > > On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote: > > > I was told that leaving it plugged in and just shutting off the power switch would save batteries. > > > > > Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed). > > > > Bullshit. The computers RTC isn't static, it consumes some power at > > all times. When the computer isn't supplying the power, the battery > > is. It isn't much, but it will cut the battery life by half. The RTC > > uses the same 32,768 hz crystal used in a digital watch, and the same > > divider chain to generate the 1 PPS, followed by additional dividers to > > track time & date. it also has additional registers to store BIOS > > settings. No CMOS circuit is perfect. All gates leak small amounts of > > current, and the more a chip has, the more it consumes due to leakage. > > but it isn't much for something specially made for low current > > I just picked the first maxim rtc on their list > http://datasheets.maximintegrated.com/en/ds/DS1339A.pdf > something like 0.5uA > > looking at this: http://www.sony.net/Products/MicroBattery/cr/spec.html > it doesn't seem to make much of a difference for a cr2025/cr20322032 speced at .2 mA discharge rate for 1500 hours. That is with a 15K load. The data sheet for the Maxium RTC states: PARAMETER SYMBOL CONDITIONS TYP UNITS VCC Active Current ICCA (Note 5) 450 �A VCC Standby Current ICCS (Note 6) 200 �A
Reply by ●September 12, 20122012-09-12
On Tuesday, September 11, 2012 3:21:10 PM UTC-4, Lasse Langwadt Christensen wrote: ... it doesn't seem to make much of a difference for a cr2025/cr2032 IC consumes so little current (nanoamps) that battery shelf life is the relevant parameter. Either battery should be good for at least five years as demonstrated by correct numbers (in nanoamps; not microamps).
Reply by ●February 25, 20142014-02-25
On Monday, September 3, 2012 6:24:44 PM UTC-5, fred.fl...@thecave.com wrote:> My computer clock battery died. It had a CR2032. I bought a CR2025 at > > a store going out of business (No Returns). Both say they are 3v. The > > CR2025 is a little thinner, but otherwise they are the same size. Is > > there any reason not to use the 2025? > > > > --------------
Reply by ●February 25, 20142014-02-25
On Tue, 25 Feb 2014 10:17:54 -0800 (PST), kmhollycci@gmail.com wrote:>On Monday, September 3, 2012 6:24:44 PM UTC-5, fred.fl...@thecave.com wrote: >> My computer clock battery died. It had a CR2032. I bought a CR2025 at >> >> a store going out of business (No Returns). Both say they are 3v. The >> >> CR2025 is a little thinner, but otherwise they are the same size. Is >> >> there any reason not to use the 2025? >> >> >> >> --------------The thickness (3.2mm vs. 2.5mm), and the energy that goes with the size difference. Both are have a diameter of 20mm (hence the 2025 and 2032 numbers).
Reply by ●April 30, 20142014-04-30
On Tuesday, September 11, 2012 8:16:34 AM UTC-7, Michael Terrell wrote:> westom1@gmail.com wrote: > > > > > > On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote: > > > I was told that leaving it plugged in and just shutting off the power switch would save batteries. > > > > > > Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed). > > > > > > Bullshit. The computers RTC isn't static, it consumes some power at > > all times. When the computer isn't supplying the power, the battery > > is. It isn't much, but it will cut the battery life by half. The RTC > > uses the same 32,768 hz crystal used in a digital watch, and the same > > divider chain to generate the 1 PPS, followed by additional dividers to > > track time & date. it also has additional registers to store BIOS > > settings. No CMOS circuit is perfect. All gates leak small amounts of > > current, and the more a chip has, the more it consumes due to leakage.Sounds to me like somebody forgot to eat their cornflakes this morning. Let's not get our chemistry mixed up with our biology? Here's the bottom line.......it will work. I've been using the cr2025 in my IBM computer's clock for the past 12 years. I haven't noticed one bit of difference. Furthermore, I understand that lightning will strike anything...even trees that do not supply power to anything at all!! Hmmm, imagine that?
Reply by ●April 30, 20142014-04-30
On Wed, 30 Apr 2014 02:00:34 -0700 (PDT), "professor/grant" <coolray481@gmail.com> wrote:>On Tuesday, September 11, 2012 8:16:34 AM UTC-7, Michael Terrell wrote: >> westom1@gmail.com wrote: >> >> > >> >> > On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote: >> >> > I was told that leaving it plugged in and just shutting off the power switch would save batteries. >> >> > >> >> > Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed). >> >> >> >> >> >> Bullshit. The computers RTC isn't static, it consumes some power at >> >> all times.<snip>>. I've been using the cr2025 in my >IBM computer's clock for the past 12 years.Ah! - maybe that would explain your replying to two-year old posts...
Reply by ●April 30, 20142014-04-30
