What battery for what model notebook. This info would be need to even try to answer your question.
The battery will last until if goes dead. As to how long that will be it all depends on how you use your notebook.
Sorry, I thought that this general hardware group wasgeneral hardware for Inspiron -- I shows up when I followthe community link to Inspiron.
I have an Inspiron 8000, with 8-cell lithium ion. Supposeto last 3 hours on a full charge (when new). Voltage is14.8V, takes 1 hour to charge if laptop is off, 2.5 hours iflaptop is on.
The processor is a Pentium III, running approximately500-700MHz.
Here's my math to get a ball-park figure. The AC adapteroutput is 3.5A. Let's make a major assumption, and say thatall of it gets packed into the battery. Over 2.5 hourscharging, that packs Q=31500 coulombs of charge into thebattery. Since the battery supplies power at V=14.8V (say15V), the energy is E = Q x V = 472500 joules, or E = 131watt-hours. This energy is fed out over t = 3 hours, so thepower is P = E / t = 131 / 3 = 44 watts. So the laptopdraws around 44 watts. The number seems high, but for all Iknow, this could be normal for laptops. The PCMCIA card's1.3 watts would be neglegible.
However, I've heard people mutter that the battery mightbe around 60 watt-hours, in which case the laptop draws20 watts over 3 hours. The card's 1.3W would stillrepresent a neglegible load, but it would be nice to beable to get a sanity check (or even better yet, anda figure based on vast experience).
P.S. Is there a way to copy these postings to myself?The PC that I'm using to read the forum doesn't have accessto my mail server, which I access from a solaris environmentrunning mozilla. When I try to read this forum using mozilla,the popup for emailing a forum posting doesn't work.
according to here
a replacement battery for an Inspiron 8000 is rated at 4460mAh 14.8Volt
4460mAh, I /assume/ means 4.46 Amp-Hours, which would be 14760 coulombs. About half of what I calculated, which corroborates with the 60 watt-hour figure that I said people were muttering. Looks like they were right, and the power adapter's output current doesn't all go into charging the battery. Thanks.
Doh! My mistake. The 2.5 hours charging time I used was for when the laptop is turned on. Duh. No wonder it gives a Watt-hour figure for the batter that is twice what people were muttering.
A card wattage is specified here http://www.smc.com/files/AN%5C2835WV3.pdf as a current drawn from 3.3V. Because of the context, I expect it is meant to be interpretted as the constant-current equivalent (equivalent in terms of power). /If/ the laptop's 14.8V is converted relatively losslessly to 3.3V, then the wattage is trivial, around 1.3W. If the 400mA is drawn from the 14.8V somehow, then it is nontrivial, about 6W. It all depends on how the Inspiron was designed to get 3.3V from from 14.8V.
Strange that the 1.3W doensn't seem to jive withhttp://www.synack.net/wireless/consumption.html in terms of order-of-magnitutde, which shows hundred of mircrowatts.
Regarding overhead in keeping known to the access point during idle periods, the power consumption probably depends as much on the card design as it does the spec.
Thanks for pointing out the 11Mbps, it was confusing so I must have glossed over it. (It says 11 Mb).