Inogen BA-403 External Battery Charger

This is an Inogen external battery charger, model BA-403. It's designed specifically for charging the BA-400 and BA-408 batteries used with Inogen One G4 and G5 portable oxygen concentrators. It's a handy accessory if you need to top off a spare battery while you're still using your machine. Used, but the casing and connector pins are in good shape.