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Dr. Battery Advanced Pro Series Compaq Presario CQ56-170EM LHP234X-AP 7800 mAh / 84Wh Notebook Battery - BattDepot United States
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Synergy Digital Laptop Battery, Compatible with Compaq Presario CQ56-100SG Laptop, (Li-ion, 10.8V, 8800mAh) Ultra High Capacity, Replacement for HP MU06 Battery - Walmart.com
HP Compaq Presario CQ56-110US Battery Replacement - iFixit Repair Guide