How long do I charge the SimplyGo battery?

The battery for the SimplyGo can be charged while it is installed inside the unit and the unit being connected using the AC wall power cord. While using the AC power cord, you can charge the battery and use the concentrator simultaneously. You can also connect the DC cord to your vehicle. The battery may charge depending on the setting your SimplyGo is at. If the SimplyGo is shut off while plugged into the vehicle, the battery will charge. You can also use the external battery charger to charge the battery. This is very beneficial for those with multiple batteries.