Dude, you want the laptop to run full power mode while on a 5 amp battery? Charger gives 9 amps, genius.
You really must be slow in the brain, or something.
For it (the battery) to give 9 amps, you'd need something looking close to a car battery!
You are one of those geniuses who expect a gaming rig to work on battery, when they need 500watt gaming power sources.
If you have a desktop pc at home,I suggest you take your desktop back to the reseller and tell him you were expecting it to run off 2 x AA batteries!