This is a brand new Lenovo L18L4P71 battery for the ThinkPad X1 Gen 7 Carbon laptop (2019). There are several generations of Lenovo ThinkPad X1 Carbon laptops and they all use different batteries. You can locate the Type number on the bottom of your laptop that precedes the long serial number.
This L18L4P71 battery is located inside the laptop case and will need to be opened in order to change the battery. This is a user replaceable task if you have a small phillips head screw driver. There are 7 Phillips head screws that need to be removed to pop off the keyboard cover. The keyboard will come off and expose the battery. The battery has a ribbon cable that inserts into the main circuit board. This ribbon cable will be removed and the wiring harness on your new battery will plug into the motherboard in the same opening.
This Lenovo L18L4P71 battery features the highest quality lithium-ion cells and components. Li-ion battery technology provides longer run times with less weight. This Lenovo battery is 100% compatible with the original battery specifications and is individually tested and backed by a 1 Year warranty.