Is it possible to have battery technology that can't be duplicated?

I'm creating a near future world where one faction is using high energy density batteries that enable their vehicles to outperform gasoline based technology. Like cold and silent aircraft and helicopters, electric cars with enormous range, ion drive drones, raygun handguns, etc.

The world in general"”and Tesla in particular"”would love to reverse engineer their technology.

Is it possible to have such battery technology that the world's top companies can't reverse engineer?

Notes:

• Battery samples are occasionally acquired.

• Technology level is present age.

• I would prefer answers at least rooted in science, beside simple hardware.

• By impossible, I mean technology impossible in the present or near-future (say 5-10 years).

posted over 5 years ago

Koras‭

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