Green Cell AP14WX is a replacement battery for 13-inch Apple MacBook Air laptops. It is listed for models A1369 and A1466, from Late 2010 through Mid 2017, and replaces batteries marked A1377, A1405 or A1496.
Lithium-polymer cells provide a stated capacity of 55 Wh. Voltage is listed as 7.4 V / 7.6 V; another specification gives 7.6 V and describes capacity as 54.4 Wh (55 Wh). These are the published values for this model.
The battery has a black ABS plastic enclosure and control electronics. Its listed protections cover overcharging and deep discharge. As a replacement power source for the named MacBook Air versions, it lets you use the laptop away from a fixed power connection when its fitted battery needs replacing.