Battery is quickly discharged, possible cause incorrect vga drivers ?

[JoopGraaf]

Everything went well on the first sight.
But the battery is very fast empty, and the CPU is working very hard.

So I checked it with powertop. I don't know if this correct but I saw 2 video cards????

Usage Device name
177.1% CPU use
100.0% Audio codec hwC0D3: Intel
100.0% Audio codec hwC0D0: IDT
100.0% Display backlight
100.0% Display backlight
93.3% Display backlight
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1
100.0% PCI Device: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port
100.0% PCI Device: Intel Corporation 3rd Gen Core processor Graphics Controller
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller
100.0% PCI Device: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 5
100.0% PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1
100.0% PCI Device: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode]
100.0% PCI Device: NVIDIA Corporation GK107 [GeForce GT 650M]
100.0% PCI Device: Intel Corporation Centrino Wireless-N 2230
100.0% Radio device: iwlwifi
100.0% USB device: usb-device-8087-07da
100.0% USB device: xHCI Host Controller
100.0% USB device: EHCI Host Controller
100.0% USB device: USB-PS/2 Optical Mouse (Logitech)
100.0% USB device: usb-device-8087-0024

So I checked it with lspci and yes there are realy 2 cards???

lion@simson:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107 [GeForce GT 650M] (rev a1)

My question are:
Why are there 2 cards?

Which one is my ubuntu using?

Do I have to install the original driver(NVIDIA-Linux-x86_64-310.40.run) from the Nvidia site?