Amazon.com: Futurebatt 6Cell 5200mAh Battery for HP 420 HP 425 HP 4320t HP 620 HP 625, ProBook 4320s 4321s 4325s 4326s 4420s 4421s 4425s 4520s 4525s Notebook 593572-001 : Electronics
Battery hp 4520S CORE I3 - iMedia Stores
Battery for HP ProBook 4520S,replacement HP ProBook 4520S laptop battery from Singapore(5200mAh,6 cells)