Batterymarket&reg; 4850mah/54wh Laptop Battery for Acer Aspire Timeline M3 M5 Series Ultra U M3-581tg M5-481tg M3-481tg Kt.00303.002 Bt.00304.011 Ap12a3i Ap12a4i 3icp7/67/90 Battery type: rechargable Li-Polymer Battery; Voltage :11.1V. Capacity:4850mAh/54WH / 6Cells 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support,12-month hassle-free warranty. 30Days money retum guarantee