After 2 years it looks like my jetBook is near death

. The problem is either the power button, the battery, or maybe something gone astray with the inactivity sleeping function.
The device almost never turns on now -unless- it is plugged in. If it is plugged in I can turn it on and then disconnect the USB adapter and the power will stay on. Without the power plugged in it tries to start up and then immediately goes blank, or sometimes will flash the battery lightning bolt before turning off again. Once in a while just to give me false hope it brings up the book I am in the middle of reading before dying a few seconds later.
Anyone else with an older jetBook (original) seeing death throes? I sure hope this problem is just mine and isn't a design issue. Is it possible to crack open the case and swap out the battery or is it saudered in place?
Side note for posterity's sake before the jetBook dies and I forget to mention it:
I have a minor case of the jiggling text issue. Its not gotten worse nor magically fixed itself over time. It does seem to be somehow direct sunlight related and not temperature -- I've see it on a sunny cool winter day in the PacNW and not seen in the shade in summer hot, muggy tropical weather.