I'm using compaq cQ-42. 2GB RAM, 500GB HD, os- ubuntu 12.04LTS. I'm facing the problems that whenever I start charging my battery then it's not totally full and white light flash and say full charged. Again when I turn off the laptop, then no problem it takes time and fully charged. In addition, the battery backup time is limited almost 2.30hrs. Moreover, the heat is sometimes temp got 74-79 degree.Always it start with 40+ and belongs to 50-60 degree. And specially my laptop HDD portion becomes so hot and also I can listen the noise of fans. I'm using clean fans and Jupiter tools but I'm not satisfy. Please help me?