At night I had 100% battery, about 20 hours later 90%

Last night around 1 AM I shutdown and put away my computer with a 100% battery. Around 10 PM, I unlocked the computer from my laptop lock. I started up my computer, it reached the login screen, I plugged in the cord, and it said 90%.

This could be a one time thing, I'll test it again tomorrow.

But if it isn't, is this bad?

I have an ASUS N55SF. The ASUS power software has been uninstalled.

 

A lot of the time laptop batteries will drain slowly over time, even though your computer may be off. 10 percent drain in slightly under 24 hours seems fairly normal, I wouldn't be too concerned.

You can improve the life of your battery by conditioning it, this involves letting it drain completely before charging it completely every time

 

Was the machine in standby or shutdown (or hibernation)? Lithium batteries shouldn't really drain THAT quickly on their own unless its got something drawing on it.

I'm guessing it's one of the following:
A) it was a surface charge and your battery is tired
B) the machine has some small, constant draw (they all have SOME)
C) the machine was in standby and not fully shutdown.

JD

 

It was fully off.

I put my computer away at 1 AM. At 9:45 AM, I turned in on (unplugged), it said 97%, and then I shutdown. I locked it back up and went to class. I just got home (5:40 PM) and started it up. It was down to 94%.

So I take it this is not too unusual?

 

Do you know what you are talking about???
My laptop battery drains 1% in a few days.


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Yes, I do know what I'm talking about. Some laptop brands and models will have inevitable battery drain even when off. Great that your laptop doesn't drain as much, but that's not always the case with every type. If you contact and ask any laptop support, they will tell you that 10% battery draw per day is within spec. Unfortunate yes, a huge problem, no.

 

I still can't believe. Have never heard of that before.

So you charge your battery full, leave it aside for 5 days totally off and half of the battery is gone! Sounds crazy to me. There should definitely be a circuit design error somewhere. Li-ION chemistry is not *that* bad for self-drain.


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Right now it says "99% available (plugged in, not charging)"

Early today and yesterday it used to go up to 100%

 

Between 2 AM and 8 PM it went from 99 to 94 in disuse

 

Does your laptop support the "charge while off" USB ports? If so, can you disable that in the BIOS? Most machines with that will drain the battery even when off slowly...

 

Fully charged on an ASUS laptop is 95% to 100%, because of built-in overcharge protection in the circuit. It will still trickle charge up to 100% sometimes, but the fact that it is around 95% and stops charging is nothing to worry about.

If you are leaving it overnight, powered off completely, you shouldn't lose anything more than 1%ish unless your battery gauge needs to be reset or your battery is dying/faulty. The phenomenon you are describing is called self-discharge.

You can leave a healthy battery at room temperature for a month without losing 5% charge.

If you suspect your battery gauge is out of whack, download a utility like batterybar and note the capacity and wear level. Run it down to around 15% and then reboot into the BIOS setup menu (F2 as soon as the system is turned on). Then leave it there until the system powers itself off. Fully recharge the battery and your gauge should reset itself. Then note the new values in batterybar and compare them to the original numbers.

Deep-discharging is not recommended on Li-ion batteries, you are most likely thinking of NiCd which has "memory effects". The deep discharge-recharge cycle is good only for resetting the battery gauge and should not be performed often, say once every month or two at most.

If you want to extend the life of your battery, keep it at a cool temperature (refrigerator), away from moisture (ziploc bag), and store it at ~40% charge when not in use. Actively charge it when possible during use, avoiding deep-discharges unless absolutely necessary.

 

My BIOS is using default battery settings.

ASUS sent me a new battery. It seems to have the same issue.

I have noticed, I still have ASUS InstantOn and ASUS FastBoot installed. Should I uninstall them?

 

No you shouldn't remove them... You may do as I do.. as much as I use my laptop at home I leave the battery off the laptop and charge it once a week which make it to get a longer lifetime, and use it simply plugged in.

 

I drained the battery to zero. At 6 PM it will be charging for 24 nearly continuous hours.

When I get a chance, I will look into the nightly discharge to see if it has decreased.

I will also see what happens when I unplug the battery from the system at night.

 

I usually remove the battery from the pc when not being used. The computer will consume energy when off (provides power to computer for when you push the power button and that other things. it has to sit and monitor the power button or else it wont come on).

I have left batteries for a few weeks/months and they are at the same charge as when I put them away. All that happens is they drain a little faster depending on how long they sat.

10% overnight is absurd and cause for concern in my book. Check the Mwh ratings of the battery with HWMonitor or a tool similar and see how it compares to the original capacity. If the new battery works fine, then your golden

 

You left it out for how much time without charging???

 

I just got my new asus laptop (N53SV)
i'm wondering whats the best way to keep the battery in good condition.
I only take it to school once a week, so during the other days should i remove the battery and just run it off AC power?

OR should i keep the battery in the laptop with the ac plugged in 24.6 ?

 

To be clear, I am not losing 10% overnight, on one occasion I lost 10% in something like 20 hours, but it could have been ~8%

On the new battery before I did the complete discharge, I did go from 98% to 94% from one night or early morning (2AM) to the following evening (7PM-ish).

It has been continuously charging for over 24hr since it drained to 0%. I will be unplugging and shutting down tonight, tomorrow evening I will see how much discharge there is.

If it goes down significantly, then I will repeat the process with battery unplugged when the laptop is off. It could just be that ASUS has a crappy battery model

 

Guys, some types of system software, like virus scans, can wake a machine up while it's sleeping in order to run. This would explain an occasional drop in battery on what would otherwise appear to be a fully sleeping machine. This won't happen when the machine is fully off, but I think sleep and hibernate are fair game.

 

Problem is I never hibernate. When I unplug, I fully shutdown

At 1AM I put my computer away with 100% charge. At 10:30AM it was down to 97%. I removed the battery. I am on campus right now, tonight at 7 PM-ish I will put the battery back in and see what the battery level is.

If it is still 96-97% that would mean that my turned off laptop is drawing a fairly large charge. If it 95% or less that would probably mean that ASUS N55SF batteries are just crappy.

 

So I just putted my battery in, it still was 97%. So my laptop is pulling charge when off... Anyway I can figure out what I can do to stop it?

 

Bumping

Anyone else with an N55SF see this problem?

 

There is a lot of good information here:
http://forum.notebookreview.com/not...icles/444615-remove-battery-when-not-use.html
Congats on the new machine also!!

 

Had mine a couple of months. It usually sits with the A/C plugged in and left in standby when not being used.

I'll experiment with the battery and come back to you with results...

 

Good call the N55F does support that feature.
OP - Try removing AI charger software and test, if there is no BIOS setting to disable that feature.
(Are you using version Version V1.0.2 ?)
If not you could also try to update ASUSTeK Computer Inc. -Support- Drivers and Download AiCharger

 

I don't have AiCharger installed. My BIOS is set to defaults. When my computer is off and unplugged, I do not have charging USB ports.

These days I just remove the battery when I unplug. I asked someone who posted a review on Amazon.com if they have this issue and they responded "A few percent is what I would typically lose overnight". I think this is just a design problem. I sent ASUS a tech inquiry online about this over a week ago, no response...

 

Do you unplug first then shut down, or do you shut down completelly then unplug it. because during the shutdown computer disables all powersaving options and can spend quite a lot of power. 3-5% battery charge is completelly possible.

 

I shutdown completely than unplug. I am still having this problem, and now that my battery is getting older, it is a bigger nuisance.

 

Li-ion batteries.. organic electrolyte, potential build-up of residue on the cathode material, and so on.. they discharge more when the cells age, they do that.. But typically what you're seeing is that the battery will discharge the first 5-10% very quickly, and then end up discharging normally (about 1% a day) after that. That's completely normal for lithium ion cells operating on fairly high voltage. On lower voltage cells, you won't have a noticeably higher discharge rate until the battery has aged a bit and the cells are actually damaged.

Other than that - when the laptop is turned off, the battery still is connected to a circuit, and the mainboard has some components drawing a little bit of power. I'm.. just guessing here.. but it's probably discharging more power from just being connected to the power-supply circuit than the actual draw for diodes and so on.. And frankly, disconnecting the battery to avoid that power-draw is probably not as significant for the battery's health than the fact that you're now storing it in a colder area.

There's also the entire thing with how the battery circuit logic will report a full charge even if the battery isn't fully charged, though. When the capacity deteriorates a bit after it's completely new. So you would only ever be charging the battery to what the battery logic will report is a full charge. And then the battery meter application would for example report the charge level compared to the original capacity when you're switching to battery power. And that would "lose" you some 10% of the charge pretty much right away, unless the battery meter application will store the variable "max charge" rate of the actual capacity across a fresh boot. I can't imagine that MS would care about programming something like that into the battery meter application, or, well.. not screw that up and create some sort of inconsistency