When it comes to reliable transport, the wheelchair charger is easily as important as the battery of the wheelchair itself. Wheelchair battery chargers can vary slightly in shape, size, and voltage capacity, but all are essential in providing the ability to keep your mobility device’s batteries charged and you on-the-go. Wheelchair Batteries, Power Chair Batteries, and Mobility Scooter Replacement Batteries Wheelchair Batteries – BatterySpec. Wheelchair Batteries – BatterySpec.com carries wheelchair replacement batteries for all makes and models. Power wheelchair batteries by MK battery for effective performance. AGM gel battery and lead acid batteries for mobility wheelchairs.