Taken from http://www.motorola.com/ies/ESG/testlab/article1.htm:
"Depth of discharge (DOD) is defined as the level to which battery voltage is taken during discharge. For instance, 100 percent DOD means that the battery voltage has been taken down to the lowest level recommended by suppliers. Twenty percent DOD means that 20 percent of the battery capacity has been removed. This level of DOD is often referred to as a shallow discharge. Discharging to less than the recommended voltage is known as overdischarge. The shallower the discharge, the more cycles the battery will provide. This is true for all battery chemistries. The relationship between DOD and cycle life is logarithmic. In other words, the number of cycles yielded by a battery goes up exponentially the lower the DOD. Research studies have shown that the typical cellular phone user depletes their battery about 25 to 30 percent before recharging. Testing has shown that at this low level of DOD a lithium-ion battery can expect between 5 and 6 times the cycle numbers of a battery discharged to the one hundred percent DOD level continuously." In summary, using your Li-Ion battery for 5 minutes while moving between outlets isn't going to adversely affect battery life. -Andrew (Yes, I'm a EE student, but I'm focusing on microelectronics rather than power systems) On Thursday, January 23, 2003, at 05:55 PM, James Rohde wrote: > On 1/23/2003 11:28 AM, Lauren Daudelin wrote: > >> >> On 23/01/03 12:01, "Jeremy Derr" <[EMAIL PROTECTED]> wrote: >> >>> that is, you can usually drain and recharge a LiIon battery about 500 >>> times. For most people, this is a 2-3 year life span. >> >> The thing that never been clear to me about that 500 cycles is what >> count >> for a cycle. Is it every time the battery is recharged, or a >> combination or >> what? > > Yeah, Jeremy, I was wondering - since I usually leave my Pismo hooked > up > to the AC adapter and plugged in when I'm home (and likely will until I > can get an 802.11g setup and DSL), how does the time spent up and > running > on AC count for battery cycles? :-) > > Surely there is some advanced EE graduate who wrote about this for > their > thesis and can answer this for us, right?? ;-) > > Jim Rohde -- G-Books is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Check our web site for refurbished PowerBooks | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> G-Books list info: <http://lowendmac.com/lists/g-books.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/g-books%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
