14 CFR § 382.127 - What procedures apply to stowage of battery-powered mobility aids?
(a) Whenever baggage compartment size and aircraft airworthiness considerations do not prohibit doing so, you must, as a carrier, accept a passenger's battery-powered wheelchair or other similar mobility device, including the battery, as checked baggage, consistent with the requirements of 49 CFR 175.10(a)(15) and (16) and the provisions of paragraphs (b) through (f) of this section.
(b) You may require that passengers with a disability wishing to have battery-powered wheelchairs or other similar mobility devices transported on a flight check in one hour before the check-in time for the general public. If the passenger checks in after this time, you must nonetheless carry the wheelchair or other similar mobility device if you can do so by making a reasonable effort, without delaying the flight.
(c) If the battery on the passenger's wheelchair or other similar mobility device has been labeled by the manufacturer as non-spillable as provided in 49 CFR 173.159(d)(2), or if a battery-powered wheelchair with a spillable battery can be loaded, stored, secured and unloaded in an upright position, you must not require the battery to be removed and separately packaged. Notwithstanding this requirement, you must remove and package separately any battery that is inadequately secured to a wheelchair or, for a spillable battery, is contained in a wheelchair that cannot be loaded, stowed, secured and unloaded in an upright position, in accordance with 49 CFR 175.10(a)(15) and (16). A damaged or leaking battery should not be transported.
(d) When it is necessary to detach the battery from the wheelchair, you must, upon request, provide packaging for the battery meeting the requirements of 49 CFR 175.10(a)(15) and (16) and package the battery. You may refuse to use packaging materials or devices other than those you normally use for this purpose.
(e) You must not disconnect the battery on wheelchairs or other mobility devices equipped with a non-spillable battery completely enclosed within a case or compartment integral to the design of the device unless an FAA or PHMSA safety regulation, or an applicable foreign safety regulation having mandatory legal effect, requires you to do so.
(f) You must not drain batteries.