Currently, I am using HP Elitebook G2, the battery usage depends on what I'm working on.
- I mostly use android studio which is quite heavy with its Gradle build. this gives me about 3-4 hours on battery.
- On light usage I can get up to 6 hours, funny enough surfing on Chrome alone doesn't hurt my battery much as others are pointing out, even when I am streaming videos.
Battery-saving tips:
- Personally I have discovered that using batteries till they "freak out" ultimately shortens the life span, so whenever my battery gets to Saving mode, I just turn off the PC.
- Working with reduced screen brightness, but don't hurt your eyes.
- I once used my PC placed on a mattress :), don't do it.