DR. BATTERY Brand New Dr. Battery Replacement Laptop Battery Compatible Lenovo Original Battery Part Numbers: 01AV419 01AV420 01AV421 01AV489 3ICP6/38/64 SB10K97576 SB10K97577 SB10K97578 Professional Series Li-polymer battery designed for Lenovo ThinkPad laptops Built with OEM-grade cells for stable performance, reliable runtime, and long cycle life Integrated safety protection against over-charge, over-discharge, overheating, and short-circuit Please confirm your original battery part number and voltage before purchase