Stone Power Lenovo 20V 6.75A 135W replacement AC Adapter for Lenovo ThinkPad W510 Series: Lenovo ThinkPad W510 4319-2NU, Lenovo ThinkPad W510 4319-2PU, Lenovo ThinkPad W510 4319-2QU, Lenovo ThinkPad W510 4319-2RU, Lenovo ThinkPad W510 4319-4BU, Lenovo ThinkPad W510 4319-4MU, Lenovo ThinkPad W510 4319-5RU, Lenovo ThinkPad W510 4319-5SU, 100% Compatible with P/N: 55Y9317, 45N0052, 45N0053, 45N0054, 45N0055, 45N0056, 45N0057, 45N0058, 45N0059, 55Y9317, 55Y9318, 55Y9319, 55Y9320, 55Y9321, 55Y9322, 55Y9323, 55Y9324, 55Y9325, 55Y9326, 55Y9327, 55Y9328, 55Y9329, 55Y9330, 55Y9331, 55Y9332, 57Y4622.