It's likely after sitting for so long that the batteries are shot. Sealed-gel-batteries should be fully charged, then totally disconnected before storage, and then put back into service within a year, or placed back into the chair and recharged again, and disconnected again.
Test the batteries using a voltmeter set to DCV, in the 20 volt or more range. Put the probes across the terminals. A good 12 volt battery should read in the 12.5-13.5 voltage area. If it isn't hitting those numbers after a charge, it is no good; time to recycle. Your chair takes two batteries, which are gel, Group 22 or Group 24 type and will cost you about $350-$450 for a set. Group 24 will give you the maximum range for this chair.
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