First ensure the battery is completely discharged by using a voltmeter or other suitable method.
If the battery really is dead it should be charged with a suitable known good battery charger for the required time, allowed to stand a few hours and then tested by putting it into use or employing a suitable method of testing.
All disability scooters and electric wheelchairs arrive with a dedicated battery charger which should be used if possible, though these sometimes fail and need replacing. In that case other methods of charging can be employed but purely on a temporary basis as there are safety concerns with battery charging.
If charging the battery does not work, it might need replacing and/or there might be a fault with the wheelchair.
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