HP ProBook 4540s 4530s 4430s 4440s 4545s 6 Cell Laptop Battery | 4330s 4331s 4431s 4435s 4535s 4536s 4441s 4446s | HSTNN-OB2R |

HP ProBook 4530s Battery Specifications: Battery Type:Lithium-Ion (Li-ion) Voltage:10.8V (can also be compatible with 11.1V depending on the version) Capacity:4400mAh Number of Cells:6-cell (standard) Battery Placement:External, rear-mounted Compatible Models:HP ProBook 4530s, 4730s, 4430s, 4431s, 4535s, 4730s series