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They're just trying to do a tad too much at once. I mean, it does decently with lightweight tasks - 6h H.264 video or 5.5h web browsing isn't bad - just mediocre. It clearly does a passable job at tamping down power draw when not under heavy loads. But for gaming it is clearly meant to be a tethered experience - you just get to choose if you game at home with the XG mobile dock or somewhere else with the built-in GPU. You could probably extend its battery a bit with a decent USB-C PD powerbank, but even something very much made-for-purpose like the Steam Deck - or even the Switch! - only lasts for a handful of hours. And even the lowest power dGPU will double power draws from a well tuned APU. The Flow X13 is likely better for on-the-go gaming, especially the upcoming/newly launched versions with 6000-series APUs, as they should deliver good gaming performance even on the iGPU, and the battery is slightly larger too. But of course those aren't handhelds either (even if they do transform into a "tablet" mode). Putting SteamOS on one of these would be interesting though ...