Replacement Battery for Lenovo IdeaPad U450A, U450P 20031, U450P 3389, U550, 57Y6309 (10pc)

4400mAh Battery for Lenovo IdeaPad U450A, IdeaPad U450P, IdeaPad U450, IdeaPad U550, IdeaPad U550A. Specifications: Attention: For the new battery, we suggest all of our customers fully charge it by AC power adapter. Maybe it take a long period, the capacity was strain out by inner PCB circuit. In order to protect your battery life, you can fully charge it to 100% and drain to 2% ,it's a cycle and the capacity will recover. it's better to make normal use after 2 cycles and charge the battery regularly at least once a month. Battery Type: Li-ion Voltage: 14.8V; Capacity: 4400mAh; Cells: 8-cell Color: Black; 100% Brand New Cells. Rechargeable Up to 500 cycls over life of battery; High energy efficiency and extended battery life. Compatible with the following models:IdeaPad U450A, U450P, U550, U550ACompatible with the following part numbers:L09S8D21L09L8D21L09L4B21L09S4B21Note: Not all P/N & compatible models are listed here.