The product offered here is a branded battery designed for the Lenovo ThinkPad X1 Yoga 4th Gen with a model number of L18C4P71. It has a capacity of 51Wh, a voltage of 15.4V, and is a Li-Ion battery type. The battery is compatible with the Lenovo X1 Yoga 4th Gen in the ThinkPad product line. This battery is a reliable and quality component for extending the usefulness of your Lenovo laptop. This arrived from the manufacturer too late for my business needs, by which time I'd found a replacement locally (at a higher cost, but work wouldn't wait), making this one redundant. Includes small screwdrivers & spudger set. Removed carefully from anti-stat pouch only long enough for these listing photos. Ships in original manufacturer anti-static pouch & packaging as seen in photos.