Any replacement battery needs to be capable of braking the airplane to a stop (under extreme weight and speed conditions, if they were honest in the specs).
They could redesign the brakes so that they are normally fully on and elictric power is only needed to hold them off. Some bird's feet work that way - by default they grip any twig the bird perches on and effort is needed to release the grip when they want to fly away. That way, the bird can sleep without falling off its perch.