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.
Hmm, promising, but I think in order to really "use" those, one would have to increase their size -> capacity, which would come at a hefty price tag.
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