Turbine engine containment isn't about containing the foreign object - it's about containing the ludicrously energized turbine blades. What breaks the blades is

Turbine engine containment isn't about containing the foreign object - it's about containing the ludicrously energized turbine blades. What breaks the blades is almost irrelevant. I'm more concerned about damage to the non engine areas of the aircraft, but they routinely survive 18 lb bird impacts in the wild. Even with lithium batteries being about four times denser than a bird, the weight being so much less means that the penetrating power should be less than a half that of a goose.