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Thanks, but i'd appreciate some more comforting words, too.

Also, can we get some additional info on the pic?

Link to an article: BETAVOLTAIC BATTERY RATED TO PROVIDE POWER FOR 50 YEARS

While the batteries in the picture and article are low power/long life batteries, it's only a matter of time before the Wh/kg of battery tech reaches a point these drone swarms become feasible.

On the bright side there's money to be made developing personal low-range EMPs or similar for defence, but that's another can of worms.