short battery life less than 2 hrs

so I have had this computer for a few months (maybe 5) and it's battery life hasn't always been great, with it's battery life (on full charge) for about 2 hours. 

I didn't know if this is a normal case or not but it's been bugging me for I need to recharge it 2-3 times a day and sometimes I really need it to last all day.

anyway to fix this?