If your moving around and don't expect to access any Wireless networks, turn off your Wifi, will save a decent bit of power.
Lower your brightness.
Swap your HDD to an SSD, uses less power but a ton more expensive for the capacity.
Dedicate a weekend you wont be using it too power cycling it. Drain the battery completely, plug it in to charge and leave it like that until its 100% and then leave it there for an hour. Drain completely, charge back up and leave there. Rinse and repeat a few more times.
This will restore your battery life to an extent, I found a laptop that barely lasted day would last a day and a half after power cycling it.