Amazon.com: Synergy Digital Laptop Battery, Compatible with Asus K72K Laptop, (Li-ion, 11.1V, 6600mAh) Ultra High Capacity, Replacement for Asus 70-NX01B1000Z, 70-NXH1B1000Z, 70-NZY1B1000Z Battery : Electronics
6Cell Laptop Battery For ASUS A32-K72 K72JM K73S K72Y K72JF X77V N73S 5200mah | eBay