Inogen One G4 Replacement Column Pair - Oxygen Accessories - Two Removable Metal Columns - 0.63 lb., 2.21 in. W x 2.37 in. L x 5.50 in. H

The Inogen G4 column pair is a genuine part manufactured by Inogen, as confirmed by multiple customers. This replacement product is especially useful for those with an Inogen G4 model, as other models may require different-sized columns. The battery included with this product is not a standard replacement battery and in most cases, the G4 comes with two standard batteries: the BA-400 and the BA-408. As for the shelf life, these columns only last for about 6 months if unused. The machine will direct you on how to reset when replacing the pillars. The frequency of replacement varies but, in most cases, it depends on the machine usage, with Inogen claiming that columns would only require replacement one to two years, though some customers have noted having to replace theirs in less than six months. Customer reception is generally positive, possibly due to the product being a genuine part and its affordable price. Shipping is quick, and the product arrives in the correct container. Some customers expressed dissatisfaction with the six-month shelf life, as it can be challenging to use the columns before their expiration, while others experienced early malfunctions or defects. Still, some sellers would replace these defective units free of charge.