X205-SLi5 alternative battery power?

hey guys, i just recently got an X205-SLi5 and was wondering where i could find a universal laptop battery, or some kind of UPS that i could plug my AC adapter into and add maybe 30-60 min on conservative power. i've looked everywhere, but every universal battery doesnt have tips that match the x205 and the batteries that ive seen that you can plug the AC adapter into might not have enough watts to power the laptop long enough. i dont know, the battery only runs for about and hour and a half, i dont want to buy a new battery and have to swap it out each time i need more power... if anyone could help me, id be appreciative. thanks.

 

Same here I got the sli1 and with it set to high performance I only get 45 minutes of gaming on battery playing Call of Duty 4 multiplayer. I was trying to search for an extended battery that could hold more juice but can't seem to come across such a thing. It sucks having to be by an outlet all the time. If anyone does have a suggestion please post.

 

You guys mean something like this?
http://store.coyoteadapter.com/unlaba1.html
The problem with these kind of batteries is, that you can't really game on them. You really should just look into getting a spare battery.

 

why can't you use it for gaming?

 

well i dont plan to use it for gaming, i plan to use it to take notes at class, but the universal batteries like those you showed require tips and im 99% sure it wont have the damn unique x205 tip...

i was thinking something more like this
http://www.blackanddecker.com/ProductGuide/Product-Details.aspx?ProductID=17894
but specially made for laptops...and perhaps bigger with more power.