Microsoft’s new Surface tablets have been all over the news this week, but now their lesser known details started appealing. One of them would be the price, that’s not known yet and another is the battery life that’s considered inferior to the one of the iPad, according to the estimations made by Computerworld.

Microsoft only revealed the watt-hour capacity of the batteries on the tablets, without estimations on how long they would run. As you know, battery life is critical for a portable gadget such as a tablet, so for Microsoft to leave that out was a strange move. So, moving on to determine how much battery life the Surface has, know that a 30 Wh rating means that the battery produces one watt of power for 30 hours, or 6 watts of power for 5 hours. Microsoft gave its slates a 31.4WH rating for the Windows RT version of the device and a 42 Wh rating for the more intensive Windows 8 Pro unit.

The latter runs on Intel CPU that’s certainly more power hungry than the Nvidia Tegra solution used on the other version. The current Apple iPad, offers a 42.5 Wh rating, meaning that it will last for 10 hours when browsing the web, watching movies and listening to music. To conclude the comparison, the Windows RT Surface battery is 25% less capacitous than the one of the iPad 3, so this means it will provide 7.5 hours of lifetime, a figure that even Android tablets can beat easily, either those made by Samsung or ASUS, for example.

The Surface Windows 8 Pro version will have a lifespan of 6 hours according to the analysis of the experts, so that’s a bummer too. However, you should still remember that these are merely speculations and we can’t tell till we test the product.

  • DeianStancu

    Wait wait wait. Those people don’t know the first thing about CPU’s and power saving.
    Comparing raw battery power is childish. A tablet battery life depends on CPU type, screen type, WiFi/Modem and power saving when idle yet not asleep.

    You can’t compare an autonomy based only on battery capacity, because it’s like knowing what’s in your neighbour’s garden.

    For comparing the two platforms, you need to do some real testing, speculating is FUD. We’ll just have to wait.

  • Stephen Collins

    I seriously doubt if there were any experts involved in this so called analysis since no links were provided. And then give us a headline as if it was a proven fact. The writer ought to be ashamed of himself for foisting this on us. The iPad needs the higher wattage battery due to the power hungry display.  If it had the same battery as the iPad2 then it would get a lot less time on a charge. This “analysis” could have used the same methodology on the iPad 2 and came to the conclusion that the old iPad had an inferior battery life compared to the new iPad but we all know that would not be true given what we know.  Was this posting just trolling for clicks or does Tablet News have an axe to grind against Microsoft?

  • Itsalso Aname

    what about replacable batteries?
    many win8/rt tabs will have such feature

  • You need to have the voltage of the Surface RT to calculate Wh in mAh