where could buy a longer life battery for my Compaq laptop

Question:Does anyone know the possibility of upgrading the Compaq Presario 900 battery on a compaq Siemens Amilo laptop and, if so, what is the cost? I am totally lasts just 45 minutes of battery life before plugging into mains. Destroys the convenience of a laptop.The manual gives a battery running time 2hour which is pathetic. No-one tells me this when am buy the laptop in the first place. do you think longer battery life costs a lot more. Answer:For a compaq laptop, one hour is probably all you can get with batteries. Check http://www.mainec.com and http://www.new-laptop-battery.com for your model of your laptop and battery. It'll give you prices, and check the descriptions to see if you can get a battery with a longer life.Try this address:http://www.mainec.com/laptop-battery/ And attempt to use this battery: Compaq Armada 7800 battery , Compaq Armada E500 battery , Compaq Armada M700 battery , Compaq Evo N1000C battery , Compaq Evo N600C batteryHope this is the right one.