Few steps would make your battery runs longer:
1. Do not set more brightness and contrast on your screen which harms your eys and consumes more power.
2. Put on stand by if you are not using it for more than 5 minutes
3. Bigger screens would take more power. 15" screen would be more than suffiecient for most of our needs.
4. Do not overcharge the battery
5. Do not let the battery drain completely. Recharge it once the battery level reaches below 20%.
6. Remove the battery when you are not using your laptop for many days.
7. Turn of Bluetooth and Wi-Fi if you are not using them. They will take lot of battery power if they turned on.
All the best.