Title pretty much says it. Edit: Okay, so the choices are there b/c i was wondering to get a lightweight laptop PC than my current tx2510 us, which is just above 4 pounds, whereas the HP 2730p is 3.7 pounds and the Macbook is also a little over 4 pounds. This may change due to the slice battery i will add IF i get the 2730p, but i will probably opt to leave the PC chargers at home (the power brick believe it or not is quite heavy since i now walk around various places.) Also, my tx2510us is now quite bruised and damaged from wear and tear of my..."daily activities" and whatnot. A proper question may be, how many pounds or weight does the 2730p actually take with the slice battery attached?