Laptop was bought in online lot and has been tested thoroughly, it performs well and has no known issues that can be found. NEW battery from 2022, purchased recently.

Wiki info:
X1 Carbon (4th Gen)20161.17 kg (2.6 lb)6th Gen Intel Core
4/8/16 GiB LPDDR3 1866 MHz
(soldered)
Intel HD 520One M.2 x4OneLink+ Gigabit Ethernet
Wi-Fi + BT M.2 Card
Optional WWAN M.2 Card (?)
Anti-glare:
1920 × 1080 IPS
2560 × 1440 IPS
mSoldered charging port

Toshiba XG6 256gb nVME
8GB DDR3L

Brand new battery installed by seller
Battery info (from battery ebay seller)
Condition: Brand New - Grade A cells,100% Compatible and high quality,the best replacement battery for your laptop.
<1>.Brand: New
<2>.Battery type: Polymer
<3>.Model: 01AV409
<4>.Color: Black
<5>.Cell: 4 Cells
<6>.Voltage: 15.2V
<7>.Capacity: 3530mAh / 56Wh
battery Date Of Production: 2022

90 degree flat hinge. Ships with OEM 40 watt adapter

https://www.youtube.com/watch?v=eeZoG7wXjqM