I have bought a new 9 cells battery for my old Asus 1005HA Eee PC, and it allows more than 8 hours of continuous operation in a single charge.
Installed Stellarium into it, but I have to use the mesa version since the OpenGL support was too weak due to ancient hardware. The frame rate is very low at less than 2 fps, but it's definitely useable.
That mainland made cable from taobao works very well, and the telescope control is trivial. However, I don't really think I will want to use a PC outside, for the Nexstar hand control is good enough.