The Surface Pro 3 has a 5547 mAh battery.

Image from ifixit.com, used without permission.

My Google-fu must be getting weaker I couldn't fiind out how large the Surface Pro 3's battery was anywhere.  Like, not anywhere.  Not even on Microsoft's site.  I kept finding comparison articles that listed the compared device's mAh but not the Surface Pro 3's.  Well, as the title says, it's apparently 5547 mAh, 42.2 Wh, 7.6V. Source? iFixit.

I remembered that they (iFixit, keep up) just did a breakdown and found the Surface Pro 3 to be unrepairable, for the layman at least (they even broke the screen in their teardown, which I've never seen happen before).  I figured they might have a picture of the battery, which they did.  They typed out the battery's watt hours in the article, but not its mAh.  If they had it might have saved me a few minutes searching.

Actually, should I be looking at Wh or mAh to determine if a battery is better?  I know there's a formula to convert them (using the voltage), but is one a better indicator than the other?  I use mah because that's what I know, I guess.

Anyway, just posting this so someone further down the line can hopefully turn it up in a search.