Don't know how much help it will be but i've got a little bit of experience with them. Worked doing plant services for a nursing home for six years. Of the eighty or so residents only two had a power chair like you describe. One was afflicted with MS and the other was a stroke victim. It's definitely a specialty item.
One thing to think about is that a person lived in that chair seven days a week for quite awhile. They ate and drank as best they could but a lot of it gets slopped and falls down into the underneath parts. They were also in adult diapers and sometimes the diapers leak if you know what i mean. All around ..... not too sanitary. That probably explains why a lot of healthcare facilities wouldn't accept a used wheelchair as a donation.
If somebody had success with parting em' out that might be your best bet.
If you wanted to test it .... they really aren't all that complicated. There's the battery charger unit. The battery, motors on each wheel, and the joystick controller. It's more likely to be a 12 volt system but it could be 24 volts. It ought to say somewhere on the motors or the charging unit.
Hook up a battery and see what it does ?
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