My laptop's battery lasts only one hour. >.< The touch screen it has drains battery life more than a hoe does a bank account.
If you don't need it, you can probably disable it when it's not in use.
I already tried, it cannot be disabled. It's got a 18 inch screen too, so even more drainage. Desperation has led me to using Eco-mode, but it only adds 15 mins, so I just leave it plugged in all the time.