AirSep External Battery

*All battery purchases are final sale. There are no returns on batteries.* The AirSep External Batteries are the newest product from the line that created the smallest oxygen concentrators on the market. They are compatible with the Focus, Freestyle 3, and Freestyle 5. They are a lightweight, clip-on battery and just as convenient as the alternate AirSep AirBelt. The batteries can be charged at the same time in their personal charging dock separate from the unit. They are a great alternative for those who want more battery life for their lightweight portable. The batteries are small and light enough to wear underneath your jacket, making your oxygen therapy use even more inconspicuous. No more need to fuss with the belt, just clip the battery to your belt, pocket, or the unit itself. Plug it into the concentrator and you are ready to add more hours to your day out. Each battery only takes 5 hours to recharge from 0-100%. One battery will last for 3.5 hours on a setting of 2 with the Ai