Fujitsu U2010 won't really run for 11 hours


So the internet is ablaze with excitement today over the newly reported "11-hour battery life" of the Fujitsu LOOX U/B50N (better known as the U2010 or U820) with its optional 4-cell 5800mAh li-ion battery. Since many sites rewrite information from a single source without doing any additional research, few are questioning why the U2010’s official press release mentioned only a 9-hour runtime . . . and that was with the SSD option. Extended battery life with the standard HDD was listed as "up to 8 hours."

There’s no denying that an 8-hour battery life is excellent for a UMPC, but 8 hours is hardly 11. In fact, it’s nearly 30% less.


The LOOX U/B50N specs do state that "about 11.1 hours" is possible with the high-capacity battery, so Fujitsu isn’t intentionally trying to mislead or deceive consumers. The reason for the discrepancy, unfortunately, is what you see there in the parentheses next to "note 16" above: JEITA determination 1.0.

The JEITA (Japan Electronics and Information Technology Industries Association) Battery Run Time Measurement Method for Notebook PCs was introduced in 2001 and has been used ever since by manufacturers like Fujitsu to measure battery life. Unfortunately, as UMPCPortal highlighted over a year ago (in reference to the U1010 no less!), the JEITA test is not representative at all of real-world usage. You can read about the method here (PDF).

Steve recommended that we "reduce manufacturer’s [battery] claims by 30%" when JEITA is concerned, which as you can see from the U2010’s 11-hour JEITA estimate and the 8-hour press release estimate is still very good advice. Apply that rule to the LOOX U’s standard 5.3-hour JEITA runtime and you’ll see that the 3.5-hour figure revealed last month is probably accurate too.

In short, expect about 4 hours with the standard battery and 8 hours with the extended one from the new Atom-based Fujitsu LifeBook mini convertible UMPC.

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Jenn K. Lee

Jenn K. Lee is the founder of Pocketables. She loves gadgets the way most women love shoes and purses. The pieces in her tech wardrobe that go with everything are currently the Samsung Galaxy Note II, Sony Tablet P, and Nexus 7, but there are still a couple of vintage UMPCs/MIDs in the back of her closet.

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6 thoughts on “Fujitsu U2010 won't really run for 11 hours

  • Avatar of Patrick Perez

    My big question is whether the bigger battery will fit in my U810.


  • Hell I only really work about 5 hours a day between coffee breaks so that works great for me …LOL

  • Patrick, it’s possible – but, the battery is only 600mAh bigger than the U810 (5200mAh)
    so 10% more … may not be worth the $150 expected price for the battery ?

  • Avatar of Patrick

    Brett, good catch. My failing memory had the U810 as a 4400MAh battery, so the increase would have been much more worthwhile.

    Would would really be useful for me is an adapter to use one of my Stylistic batteries as a power source for the U810 (or for USB powered devices). I should think (knowing nothing about electrical engineering) that it would be fairly simple…



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