Inogen One G5 batteries will charge automatically while in the InogenOne G5 device (when connected to an AC or DC power supply), or using the External Battery Charger. Four lighted indicators on the battery indicate current overall charge.
Usage Information: For best results, Inogen One G5 batteries should be fully charged, via AC (wall) power, prior to first use. Some vehicles may not have sufficient power output to the DC Power Supply to both operate the device and charge the battery. Test your vehicle's charging capabilities prior to taking a trip.