Amsahr Replacement Battery for Acer Aspire 4745, 4820gt, 3820tg, 3820t, 4820t, 4820tg, 5820t 18 Months Manufacturer Warranty, 100% Satisfaction Guaranteed. 100% Compatible Non-OEM : Lithium Ion (Li- ion) Long Life Battery: Rechargeable with No Memory Effect and Power Surge Protection. 4400 mAh, 10.8 Volts & 6 Cell Protective Retail Packaging, Each Product is Sealed with Anti-Static Shield Sleeve. Exclusive Offering of High Performance, Long Lasting, and Durable Grade A Cell Battery Replacement Laptop Battery for Acer 4745 Compatible Non-OEM Long Life, Li-ion Battery Rechargeable with No Memory Effect and Power Surge Protection Exclusive Offering of High Performance, Long Lasting Durable Grade A Cell Battery