My battery life is terrible!

I love this camera (Canon powershot s110) very very much however I've found that I continue to buy more and more batteries and when I'm using it for a day, they don't last long at all and I get to my fourth or fifth battery within a very short period of time. If I fully charge it and then was to be using it on and off for 15 minutes, it would go soo fast. Is there any fix for this because I use it for holidays and need it to last a plane and car journey before I get to a hotel etc or a day at a theme park etc. Even with multiple batteries it never lasts.