FSKE® 593572-001 HSTNN-CB1A Laptop Battery for HP PH06 HSTNN-LB1A PH09 Compaq 620 625 320 321 325 326 420 Probook 4320 4320s 4321 4321s Notebook, 10.8V 5000mAh 6-cell

The battery was delivered the same day. Though it was quite difficult to fit into the battery compartment, it did sit well. It works perfectly with my hp laptop and has been running fine since purchased. I have used it off the plug a couple of times and it did last about 2.5hours each time. Overall, it's good, I just dread having to slot it back in whenever it does slip out accidentally.