This AC Power Cord is designed  for use with Inogens' Portable Oxygen Concentrators, G5 and Rove 6.  The AC cord allows you to power your concentrator from standard AC Power Outlets like those found in most homes.
When attached to AC Power the Inogen POC will operate as usual and WILL recharge any battery, that is currently attached to the concentrator, as long as sufficient power is available.