Minimum runtime results of the 6-cell MSI Wind


MsiwindbatterytestFolks holding out for a 6-cell version of the MSI Wind keep wondering if it’s worth the wait. I think it is and not just for the added runtime. The 5200 mAh battery is well designed to fit nicely in the Wind and really doesn’t add much bulk at all. In fact, it adds nothing extra on the back of the device; instead, it adds a smidge to the bottom which props the unit up a few degrees. So how much runtime should you expect? I ran two different tests using BatteryEater to give you an idea.Before I share the results, let’s set the stage on what this test does. It stresses the computer non-stop until the battery dies. That means it tells you the MINIMUM runtime of the unit. Just like all of the other times I’ve run BatteryEater on devices, I did this with the screen at 50% brightness, WiFi on and no power management in Windows. So this is a worst case scenario. In the real world, you’ll see better battery life, which I’ll address at the end.

I actually ran this test two times, which is something I don’t normally do. However, the MSI Wind has a unique feature with the “Turbo” button. It used to overclock the 1.6 GHz Intel Atom CPU, but now it only underclocks it. Using this function, you can force the CPU to run only at half-speed, or 800 MHz. While this decreases performance, it should boost battery life.The other reason I ran the tests twice? Brad Linder ran the same test with his nearly identical Asus Eee PC 1000H and his initial runtime was drastically more than mine. We chatted and it turns out that he ran his test with the Asus “Power Saver” function on, which is similar to the underclocking feature of the Wind. In the case of the Asus, Brad tells me that the unit will underclock to 1.2 GHz in order to extend the runtime.OK, enough of the up-front stuff. Let’s get to the results!When I ran BatteryEater with the Intel Atom running at the full 1.6 GHz, BatteryEater stressed the system for 3 hours and 39 minutes. My initial reaction was disappointment, but then again, this is a minimum runtime with no power management. My normal usage is much less stressful than the BatteryEater test so I anticipated at least five hours of runtime. I found that Brad ran his Asus in a “High Performance” mode and saw 3 hours and 19 minutes for his 6-cell Eee PC. Perhaps the Asus actually does overclock?After my chat with Brad, I re-ran my Battery Eater test, but this time, I fixed the CPU at 800 MHz. The minimum runtime was one minute shy of five hours: 4 hours and 59 minutes. I’d estimate that you could handle the slower clock cycle, the battery would last for seven or more hours. I’ll have to spend some time with the CPU at 800 MHz to see what kind of performance it offers and if I can tolerate it. Brad used the Power Saver function on the Asus and got 4 hours and 25 minutes in his test.Conclusion: I see no reason that you can’t expect at least five hours of usage on a single charge with the MSI Wind and 6-cell battery. You might be able to eek it out to six or even seven if you underclock, but five is a sure bet for everyday usage. Obviously, if you stress the machine with heavy duty processing or video watching, that’s a close scenario to the BatteryeEater test and you’ll see less runtime.Sure enough, I took the MSI Wind to my fantasy football draft night where I had WiFi on the whole time and never put the unit into Sleep mode. I was running a single application and also browsing the web. I used the Wind non-stop in that scenario from 6:30pm to 10:15pm, or 3 hours and 45 minutes. When I shut down for the night, Windows told me that I had a 33% charge left in the 6-cell battery, which roughly tells me that 5 to 5.5 hours of real world usage isn’t out of the question at all.One last thought on the 800 MHz vs 1.6 GHz clock cycle: BatteryEater provides results on the amount of “work effort” it does during the test. I’m including the data here to show that while the 800 MHz clock cycle can increase the device runtime, it will actually do less computing overall, hence the performance hit.1.6 GHz:Msiwind16workdone_2800 MHz:Msiwind800workdoneSince very few of us sit around and calculate Pi all day, I’ll set my unit to 800 MHz and try to use it for a day at some point during the week. I suspect that for basic web browsing, it might be fine, but for any multi-tasking or video applications, it might not be tolerable.


Daniel Breslauer

Mine (MSI Wind U100 Plus) also has a 4400 mAh battery. I bought an additional one, which fortunately wasn’t any problem, they were fully stocked. Well, almost fully at this specific store – I got a black one for my white netbook, but I don’t really care about the color.

Running Windows 7 Ultimate with Basic theme and using 3G (UMTS) access, but in Power Saver mode, I get exactly 3 hours. Not too impressive, which is why I got an additional battery.


Wow, Kevin is lucky. His six cell was a 5200mAh, while my new wind got only a 4400mAH.

Does anyone know why?

Simon Dale

Hi Kevin,

I have bought a 6 cell battery for my Advent 4211 (MSI Wind from PC World in the UK) and I’ve noticed that it is a 4400mAH battery, not 5200mAH as yours seems to be.

What a shame! That’s something to beware of I guess. It seems that the extended 6 cell batteries available in the UK from places like here:

Are not 5200mAH hour batteries as they might be elsewhere.


hi kevin,
In MTR147 you said that you installed OSX in the MSI Wind.
Was it hard?
Did you get full functionality?
Estimated battery time?


Thank you for the answer, Kevin!
Maybbe I’ll get one when in the US for travel (exploiting the value of Euros in these days is awesome! :).

btw, my nick is orangeek, not orangegeek. :P


i ALMOST bought 1 recently as well but because of the shortage problem it fell through. now i’m glad it did, i found out a couple days ago from an MSI rep that they will be releasing the dual-core Atom version in October.

sorry i dont have anything to prove it but supposedly it isnt a big secret, apparently Intel is planning to release the dual-core Atom to ODM’s at the end of Sept. he told me the design will stay the same it will just be a new CPU & maybe most importantly a NEW chipset. the battery life shouldnt be affected hardly at all as the cores dynamically shut off & adjust speed per the current demand.


Thanks for the battery testing, Kevin. I’m seriously considering a 6-cell Wind — the only problem is I’ve read several places that the new Sentelic(?) touchpad they use is junk. How did you end up with a 6-cell with the Synaptics pad?


Thanks for the battery testing, Kevin. I’m seriously considering a 6-cell Wind — the only problem is I’ve read several places that the new Sentelic(?) touchpad they use is junk. How did you end up with a 6-cell with the Synaptics pad?


Mugen will probably be making a 6-cell also. i would probably get a backup 1 from them instead, most likely it would be higher cap & cheaper than anything the OEM would produce. seriously, GOOD LUCK finding a 2nd 6-cell battery MSI, and if you do good luck finding a vendor that wont rip you off to get it.

i know it’s scary to try new things, but Mugens rep is fantastic to say the least. anybody involved in the PDA world is well versed on them. time after time when major OEM’s like Dell/HP would fail producing small batteries & greatly overcharge for their replacements, Mugen would step in creating something far better & usually cheaper as well.

Kevin C. Tofel

orangegeek: I can’t say for sure yet what the battery life would be with Linux, but my estimate would be that runtime would minimally be the same, possibly up to 15% more. I’m basing that solely on my battery comparisons between Linux & XP on prior devices. Thanks to you and Chris for the kind words!

Michael, thanks for the info on the Asus Super Hybrid Engine. That 1.2 GHz underclocking might be a good “sweet spot compromise” between performance and battery life.

Tolbeir, I think I’d personally opt for a second 6-cell battery from MSI. I like how well it fits the device and between the two batteries, I’d have 10 to 11 hours of runtime. Just a personal preference; many would be happy with a 9-cell of course.


awesome stuff, i was expecting at least 5 hours as well. the problem is the 6-cell Winds are kinda hard to find.

i have been considering just getting the 3-cell Wind and adding the new 9-cell Mugen 7800mah battery when it comes out next month, can you imagine the runtime on that?! but 1st i am waiting for them to release a pic of how it looks. they do make excellent batteries though that ALWAYS exceed original OEM batteries. there is a gigantic thread going on over at about it

Michael Connick

Yes, the Asus Eee 1000h does overclock the Atom processor in super-performance mode up to 1.8Ghz. So you run it at 1.2, 1.6, or 1.8Ghz just by pressing the Super Hybrid Engine button on the top of the device. In automatic power-saving mode it alternates between 1.2 and 1.6Ghz depending on whether it is plugged in or running off the battery.



Is it worth it? Depends if you like being tied to a desk. I have the 6 cell MSI, and it’s awesome. I don’t actually get the results you’ve posted, most like 4.5 hours on full battery use. I should be going half speed for what I’m using this for.

I’m with orangeek, keep up the good work on your blog.


kevin, do you have any idea how long can the battery last with linux on the Wind?
thank you (and PS: i love your blog!)

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