Coolgo New Laptop Battery for 5200mAh Battery For LENOVO IdeaPad Y550 4186 Y450 Y450A Y450G Y550A Y550P 32415200mAh Battery For LENOVO IdeaPad Y550 4186 Y450 Y450A Y450G Y550A Y550P 3241 High-Quality: Our battery choose high quality and new lithium-ion cells, safe and reliable, stable performance which can charge-discharge more than 500-800 cycles. Quality Certication: All the products pass the ISO9001, CE and ROHS, FCC multiple international authentication and completely accord with environmental protection requirement. Consummate Design: Excellent design makes the product not only has the overcharge, discharge and short circuit multiple protection, but also to balance charge-discharge of all the internal cells. Environmental Test: Standard modern assembly line. All products have passed a variety of charge-discharge and aging test before they leave the factory. 100% quality test for all items. Operation time: For standard battery(6-cell, 4400mah): 2-3 hours; for extended battery(12-cell, 8800mah): over 4 hours (Note: The actual operation time depends on how much electricity is required by the device and how you use the battery.)