If you get the device with the 48Wh unit, it will last for no more than 6 hours of Web browsing, and a bit over 4 hours of video playback.
Try this and see if it helps.
Nicehash, which is easy crypto-mining for begginers, pays more than double of that each day here and I also won't be ripped-off when grabbing my money and now their transparency is really good.
There is one small issue: the Numpad forces the keyboard and touchpad to the left, placing them off-center.