Never seen an electric wheelchair where battery and speeds are announced, unfortunately.

I've worked with a number of people with electric wheelchairs and white canes. Controlling the speed is crucial, as it is easy to go faster than you can react with your cane. You also have to be very aware of how far you are scanning, because you have to scan past the wheel width to ensure you don't go over a drop off from the side.

Hi. I have heard of some electric wheelchairs with app companions for controlling certain settings. I don’t know if they are accessible. Maybe try getting in touch with an ONM specialist. They are trained in navigation skills for blind wheelchair users in the state where I am from. I do not know if this is part of the curriculum in all ONM Specialist courses, so you might need to ask around.