One of the most typical hardware failure of HP 100lx/200lx is a broken battery cover latch. That’s why a spare 3D printed battery cover would be a good option even if your current battery cover is intact. A free 3D model of the battery cover is available on Thingiverse. However, I was not satisfied with the quality of this model, therefore I’m glad to present you a custom (improved) version.
You can download this model for 3D printing here: HP 100LX battery cover.stl.