1). I highly recommend you read the manufacturer'sguide book about your HP laptop battery carefully.
  2). Clean your HP battery’s metal contacts several weeks with a cloth moistened with rubbing alcohol.
  3). Cut down programs running in the background. Itunes, Desktop Search, etc. All these add to the CPU load and reduce battery life. Turn off everything that isn’t crucial when you’re on hp battery.
  4). Keep away your hp battery from extreme heat and cold.
  5). Turn down the LCD screen brightness to lowest level satisfying your needs.
  6). Simplify the PC demands,The more you demand from your hp laptop. Passive activities like email and word processing consume much less power than watching movies or playing a computer game.
  7). Turn off unnecessary external devices,such as bluetooth and infrared port and usb powered devices when not in use.
  8). If you use your HP laptop as desktop pc or don't use it for a period, pls store your HP laptop battery in a clean, dry, cool place away from high temperature and metal objects.