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How much battery would leaving my laptop at "sleep" mode consume? is the consumption low enough so that it would be safe to leave the laptop sleeping at nights regularily and using it tommorow?

What's the recommended period of time for which I should not turn it off, but let it sleep. (for example, if I'll use the computer in a minute - turning it off instead of making it to sleep will definitely not save battery due to the overhead of turning your computer on and off).

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By "sleep", do you mean suspended-to-ram (also known as S3 in ACPI lingo)? – kbyrd Sep 23 '09 at 3:17
I don't think so. Isn't "suspend to ram" called hibernate? – Elazar Leibovich Sep 23 '09 at 16:23
No. Hibernate (S4) is suspend to disk, then power everything off. – kbyrd Oct 6 '09 at 3:19
My bad. I ment suspend to RAM indeed. – Elazar Leibovich Oct 7 '09 at 10:51
up vote 1 down vote accepted

I asked almost the same question here.

As for the shutting down completely thing - Windows needs to be rebooted once in a while to complete certain scheduled tasks. I would say to at least attempt to reboot once per day, but other than that, you should just sleep it for a quick launch back into the computer.

You can easily leave the thing overnight on sleep mode and it won't drain much battery at all.

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Reboot once a day is overkill. I use hibernate and don't typically need to reboot other than patch Tuesday and an occasional BSoD. – Brian Knoblauch Sep 23 '09 at 13:22
Rebooting once a day is "overkill"? I shut my desktop OFF every night, and that's overkill compared to putting it to sleep mode?! – Breakthrough Sep 23 '09 at 13:53
I think he meant overkill in the sense that windows doesn't have scheduled tasks that would need you to reboot every day. I turn my desktop off every night, but it's certainly not necessary. – Malabarba Oct 9 '09 at 16:01
D Connors - I don't think most consumer desktop PSU's are meant for a constant duty cycle... They need to be cycled once in a while (e.g. at night). – Breakthrough Oct 10 '09 at 3:41

It depends on your system.

Most people I know using modern laptops use sleep as the most common method of leaving the machine. For laptops I have had, I always let it sleep overnight or even over the weekend. From a max battery, it may last several days.

However, I know others who rarely use the laptop so they hibernate instead of sleep. For them, the laptop is used maybe once every couple of weeks.

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+1 I put my laptop to sleep every night, never had a problem with the battery being drained. They only time it might be a problem is if it was already (really) low. But new laptops manage just fine. – Ivo Flipse Sep 23 '09 at 6:34

I leave laptop regularly at sleep overnight. Consumption is low enough to last for more than a week on my model.

While consumption does depend on motherboard and other components, you should be able to get few days of sleep without problems.

Throwing laptop to sleep is very easy to get used to and I don't even recall when last actual reset occurred on my computer.

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Regarding how much battery it would consume varies based on processor, motherboard, and additional onboard components. As far as a "recommended time", it is a personal decision and up to you and your environment. I have my sleep disabled. I occasionally force it to sleep when I want to for extended periods of time (30mins or more), but it's usually always on except for the trip to/from work, so i just shut down. vista performs better that way anyway.

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I would not put a laptop to sleep overnight. If you really want to keep it "running", look for a hibernate option instead. But the best thing to do is save your work and shutdown. Laptops really aren't intended to be left on all the time.

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"Laptops really aren't intended to be left on all the time." - Leaving a laptop on is NOT the same as sleep mode. Using enough battery power to save the contents of the RAM is quite marginal, drawing VERY little current. – Breakthrough Sep 23 '09 at 13:01
It's not the same as shutting it off, either. – Joel Coehoorn Sep 23 '09 at 13:05
It's like a battery that saves the time in your watch or your PC when it is FULLY shut off. You're just providing enough voltage to keep contents available. – cp2141 Sep 23 '09 at 13:06

Depends on the system. I never had luck with Windows laptops going to sleep and waking up reliably. The best alternative to shutting it down was hibernate. This is almost always because of poorly written drivers.

My Macbook Pro, however, sleeps every time I shut the lid and wakes every time I open it... reliably. I never shut it down or reboot it unless an update requires it. It's one of the features I like most about Macs. I don't even worry about the battery running out, because if it gets that low (reserve power), the Mac is smart enough to save the system state and power itself off so next time you plug it in, you're back where you left off.

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Newer windows version will do the same, when suspending to RAM they also suspend to disk. – Malabarba Oct 9 '09 at 16:05

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