How do I conserve HP E03XL battery power?

You can manually change the power consumption of your notebook PC and conserve  HP TE03XL battery power.

• Reduce the brightness of the screen to the minimum readable level. Use the Fn and F7 or F8 keys to adjust the brightness.
• Remove peripherals when not in use. External hard drives, CD-ROMs, Zip drives, PC cards, and other peripheral devices can draw power from your battery even when they are not in active use. Disconnect them when you have finished using them.
• Reduce the speed of your processor. The faster your computer works, the more quickly it uses up the supply of power. By cutting down on processor speed, you can extend the charge of your battery. Methods to reduce processor speed vary from model to model, and your manual should provide instructions for doing so.
• Turn off the Wireless On-Off button when it is not in use. If your notebook has one, press the Wireless On-Off button so that the light turns off.
• Check for programs running in the background. Some programs automatically install a quick-start utility and run in the background when the computer is started. You can decrease the power requirements by periodically searching for and removing unnecessary programs.

Source from support.hp.com.

HP TE03XL battery 

HP TE03XL battery

Brand new HP TE03XL 11.55V 5150mAh laptop batteries
Voltage: 11.55V
Capacity: 5150mAh (61.6Wh)
Battery cells: 4-cell
Chemical: Li-ion
Battery Color: black
Condition: new original battery
Warranty: 9 months

Product link:http://www.storebattery.co.nz/hp-te03xl-11.55v-5150mah-laptop-battery-store-for-new-zealand-p-175769.html