63Wh lithium-ion battery for

The Dell W1YCT is an internal lithium-polymer battery for compatible Dell laptops. M033W is also listed as its primary part number, which can help when matching the replacement to a device.

With four cells, it has a stated energy capacity of 63 Wh and charge capacity of 3941 mAh. The output voltage is 15.2 V.

Listed suitable models include Dell Latitude 14 (5420), Dell Latitude 15 (5520), and Dell Precision 15 (3560). It serves as the internal battery in those listed laptops.