Showing your picture, I supose the battery of the HiBook is split in two parts, this is the reason because the battery have four cables, not two alike others. The numbers on the battery (30124135) means: 30 height, 124 width and 135 length (all in milimeters). The last numbers (3.7V) are the volts. You have to buy one with this measures or, better, two batteries that fit in his place.
Thak you for the picture, I also have problems with the battery of my HiBook