Good discussion with a specialist here:
What Might Happen If an Airliner Hit a Small Drone? - IEEE Spectrum
To summarise, the engine's power setting is the critical factor. At low power a drone could probably be ingested without much problem. Batteries are hard, but so is ice. There's a greater risk at high power, but drones tend not to fly in flocks so the risk of a Sully Sullenberger-type incident is almost nil.