6/9 Cells HP Elitebook 8540p Battery - 4400mAh/5200mAh 14.8V, Laptop Battery for HP Elitebook 8540p
HP EliteBook 8540W Battery
Compatible 8 cell 5200 mAh battery for HP Elitebook 8530p 8540p 8540w 8730w For Notebook Battery Rechargeable 5200 mAh 69 Wh 14.4 V DC 1 White Box - Office Depot
Replacement Battery For HP EliteBook 8530p 8540p 8540w 8730p 8740w HSTNN-OB60 - Newegg.com
8 Cell Laptop Battery for HP EliteBook 8530p 8530w 8540p 8540w 8730p 8730w 8740w - Walmart.com