I deal with wheelchairs, electric wheelchairs, oxygen systems, CPAPs, spirometry, and more every day. Electric wheelchairs are built to be very rugged and dirt simple. There are 2 problems: The first problem is insurance. People expect their insurance to cover everything. If they need a new set of 35 AH SLA batteries, they will throw their old chair away and ask for a new chair on insurance. The second problem is tha…
This is not a solution that would help the wheelchair user, but if you have a set of inexpensive ($10 bought in the US, less from china) 3" digital calipers, you could likely measure the socket and get it 3D printed. I've done it for obsolete electrical connectors in cars and while it takes time and some effort, it's very doable.