General Is it normal my battery lasts 6hours?

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http://androidforums.com – Hi, I'm very new to android and it's my first real smartphone but the battery is becoming a real nightmare!! I admit i use it intensif like whatsapp,internet all the time. I discreased even the brightness to the minimum but still i charge my battery 2x a day!! Honestly i have a car charger,another home charger in my phone to charge it at my work and a charger at my home. I have to walk around with a charger all the time!! What could be the exact problem? I don't make too many phone calls neither so i really don't know... . I have android 2.3.6. (General)