Laptop battery good for 40 hours of operation...
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So when this battery explodes, do you get nano-wires in the eye? Everyone's different but 14 hours or so is the most I can see me ever needing (trip from east coast to japan + airport wait) and usually about 1 hr is fine (compute on a bus or something) before I can plug it in. Quick charge times would be better for me, if I could have 4 hr battery life and < 20 min charge time, it would be sweet (probably could heat coffee on the battery do to the power draw too ;)).
"Everyone's different but 14 hours or so is the most I can see me ever needing (trip from east coast to japan + airport wait) and usually about 1 hr is fine.."
Laptops are not terribly useful when being used in a manner consistent with achieving their max rated battery life. You probably do want that 40 hour battery if you want it to more than be a power-consuming doorstop during that long flight :)patbob
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"Everyone's different but 14 hours or so is the most I can see me ever needing (trip from east coast to japan + airport wait) and usually about 1 hr is fine.."
Laptops are not terribly useful when being used in a manner consistent with achieving their max rated battery life. You probably do want that 40 hour battery if you want it to more than be a power-consuming doorstop during that long flight :)patbob
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Good point. Solid state drives should help a lot too, the peak operating power is much much lower which reduces the peak power load to idle load well.
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using silicon nanowires in rechargeable lithium ion batteries [^] ... expects the battery to be commercialized and available within "several years," pending testing.
Steve
I'll file this with the UCSD press releases about holographic memory in the late 1980s. Worked great in the lab and was on the verge of commercialization....
Anyone who thinks he has a better idea of what's good for people than people do is a swine. - P.J. O'Rourke
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HDD are somewhere under 2.5W. Screen backlights are quite a bit more. LED backlights would probably have a bigger impact than SSDs.
patbob
You might be thinking voltage, the stats I saw (a little old I admit but probably fairly comparible) http://www.codinghorror.com/blog/archives/000562.html">http://www.codinghorror.com/blog/archives/000562.html computer idle at windows desktop 15W, sleeping hdd power draw 14W, defraging drive usage 18W, CPU idle 15W, CPU working 26W. So hdd is roughly same draw as CPU (and similar to screen as well).
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Sure beats the 2 minutes my laptop battery is currently capable of... :sigh:
yeah, mine works for about 40 minus 38 hours (or less :sigh: ).
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You might be thinking voltage, the stats I saw (a little old I admit but probably fairly comparible) http://www.codinghorror.com/blog/archives/000562.html">http://www.codinghorror.com/blog/archives/000562.html computer idle at windows desktop 15W, sleeping hdd power draw 14W, defraging drive usage 18W, CPU idle 15W, CPU working 26W. So hdd is roughly same draw as CPU (and similar to screen as well).
Nope.. just reading the spec on the 2.5" HDD: 0.5 Amps at 5Volts equals 2.5Watts. The old 7200RPM 2.5" HDDs drew 1A @ 5V = 5W, and those suckers get pretty darn hot. And these are max numbers, not nominal, which are typically a lot lower.
Still not convinced, put one of those old 7200 RPM HDD in your laptop and see how much of a difference it makes with the battery duration -- mine only lost about 10-20% of the duration when I did, indicating there's a lot of power being sucked elsewhere. :)
patbob
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Tom Delany wrote:
WE ARE DYSLEXIC OF BORG. Refutance is systile. Your a$$ will be laminated.
:laugh: that is a brilliant sig! :laugh:
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook "There is no wealth like knowledge, no poverty like ignorance." Ali ibn Abi Talib "Animadvertistine, ubicumque stes, fumum recta in faciem ferri?"
:) Thanks!
WE ARE DYSLEXIC OF BORG. Refutance is systile. Your a$$ will be laminated. There are 10 kinds of people in the world: People who know binary and people who don't.
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using silicon nanowires in rechargeable lithium ion batteries [^] ... expects the battery to be commercialized and available within "several years," pending testing.
Steve
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using silicon nanowires in rechargeable lithium ion batteries [^] ... expects the battery to be commercialized and available within "several years," pending testing.
Steve
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Nope.. just reading the spec on the 2.5" HDD: 0.5 Amps at 5Volts equals 2.5Watts. The old 7200RPM 2.5" HDDs drew 1A @ 5V = 5W, and those suckers get pretty darn hot. And these are max numbers, not nominal, which are typically a lot lower.
Still not convinced, put one of those old 7200 RPM HDD in your laptop and see how much of a difference it makes with the battery duration -- mine only lost about 10-20% of the duration when I did, indicating there's a lot of power being sucked elsewhere. :)
patbob
I don't have a laptop hdd kicking around but there are two power draws on a hdd the data and the power for the motor. My Seagate Barracuda 7200 RPM desktop drive: 5V 0.46A (presumably for data) = 2.3W, plus 12V 0.56A = 6.72W total is ~10W. The specs on the site I linked to earlier only showed a drop from 15W to 14W during defrag versus idle. Most of the power goes to spinning the disk so idle really isn't unless you actually power off the laptop after a short period of inactivity. You're probably right on the power for a modern laptop hdd drive though (especially since the mobo's/OS are configured from the ground up to conserve energy for mobile devices.
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:) Thanks!
WE ARE DYSLEXIC OF BORG. Refutance is systile. Your a$$ will be laminated. There are 10 kinds of people in the world: People who know binary and people who don't.
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You're missing the point. Assuming this lives up to the hype it probably won't be used to make 40hr batteries. Instead the default battery will still probably be ~4 to maybe 8hrs but only 1/10th the size for a smaller, lighter machine. OTOH I might be wrong, I've never really got the 40hr mp3 player logic either.
Otherwise [Microsoft is] toast in the long term no matter how much money they've got. They would be already if the Linux community didn't have it's head so firmly up it's own command line buffer that it looks like taking 15 years to find the desktop. -- Matthew Faithfull
dan neely wrote:
I've never really got the 40hr mp3 player logic either.
Either didn't I before getting my new iPod ... believe me - it is great not to have to plug it in daily ... Now I just need a cell phone which stands ~5-10h phoning ;) Staying with the topic: 12-14h would be really enough for me too ... and looking at Dell's Latitude series with Media Bay battery ~10h are not seldom even today. But keep up the good work and power us all with nano wires soon! ;) Greetz M.T.
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Just making it last 12 hours would be great IMHO.
WarePhreak Programmers are tools to convert caffiene to code.
lasting 8 hours would be enough, that way in the end of a working day I could always give my boss the excuse that I forgot my charger home so I don't have to work overtime heheh
--------- Andre Sanches "UNIX is friendly, it's just picky about its friends"