I know this has been a couple of days ago, but still meant to reply. Regarding your numbers, not that that ~3.5 kW of _power_ density is for 10s when the charge

I know this has been a couple of days ago, but still meant to reply. Regarding your numbers, not that that ~3.5 kW of _power_ density is for 10s when the charge is _at least 50%_. Moving back and forth between two ships is also likely more than 300s, they can't just let the containers drop, they have to be carefully placed. A bigger issue is that you can't just scale the numbers of a 500g battery up to 800kg, I mean just getting the heat away will require significant effort. There is a reason the Tesla battery is ~500kg. But the biggest issue is is recharge, you can't recharge every 5 min. I mean how many of those drones are you going to employ? I mean a panamax class ship has 5000 containers. So either you need 5000 of those drones (good luck with them managing the off-onloading in 5 min) or some small subfraction, which then need to be recharged. Even if we assume we need to only move 500 containers (and use 500 drones), That means we either need to recharge 500 2333kWh batteries in 300s, how are you going to do that out on the ocean, or more likely you have 5 drones operating which need to work for 100 times as long, which increases you weight by 100. It just doesn't add up.