100$-150$ used laptop?

I was wondering if anyone had any tips for a 100$ - 150$ used laptop?
Preferably 4 cores, or 2 with hyperthreading
I have a HP Elitebook 8570p, It's ok, but the battery life isn't that good and I find the laptop to be too big
I tried looking myself, but I was wondering if anyone had any other laptops that aren't that bad in mind

Basically all that I'm looking for is a laptop with a screen of 14 inches or less
Not horrid battery life
4 cores, or 2 with hyperthreading
And most importiantly, sub 100$ or sub 150$
Doesn't matter if it comes with no battery, ram, etc for the 100$ to 150$

Used think pad or one of those 2 in one tablet laptops with a detachable keyboard may fit the build. Just an FYI anything youll find in the price range is guna be a drop in performance.

just grab a sandy bridge or newer thinkpad.

Lenovo T and X series are nice. I have an X220 I really like.

How's the battery life on it?
On ebay I could get one with 4GB of ram, no HDD, battery or charger for like 65$

Thinkpads are love, Thinkpads are life.

Educate thine self: