You can order batteries for your Airhawk Folding Power Wheelchair here:
You are looking at travel safe, non-spillable Lithium-Ion batteries that will work with the Airhawk Power Wheelchair on this page. When you order more than one battery at a time, you can save!
Please see the following videos for additional instructions:
Using The Independent Charger for the Airhawk Batteries:
Working with Dual Batteries in your Airhawk Power Wheelchair: