My battery drains really fast and my laptop gets really hot, What do I do?

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http://askubuntu.com – I just installed Ubuntu on my HP Pavilion dv6-6c50ca, and I noticed that every time that I start my laptop with Ubuntu the fan runs really fast and the laptop produces a lot of heat. When I run windows on it, the battery life lasts for 4 hours but when I run Ubuntu, it barely lasts for an hour and a half no matter what I'm doing, even when I'm typing a simple word document. Here are my laptop specifications: HD BrightView LED-backlit Display Intel core i5 2.5 Ghz i5-2450M 750GB hard drive 5400RPM Video card: AMD Radeon HD 7690M XT Battery: 6-Cell Lithium-ion Here is a more detailed specifi (HowTos)