Amazon.com: 01AV421 01AV419 T470 T480 Battery for Lenovo ThinkPad A475 A485 TP25 Series Notebook FRU 01AV489 SB10K97577 SB10K97576 SB10K97578 01AV420 for Internal 11.4V 24Wh 2100mAh 3-Cell Laptop School : Electronics
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T480. I replaced the external battery a couple of weeks ago and the internal battery last night. Was hoping to give it a full cycle for calibration this workday, but it doesn't