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From wikipedia : In 2018 a Russian design based on 2-micron thick nickel-63 slabs sandwiched between 10 micron diamond layers was introduced. It produced power output of about 1 microWatt (μW) at a power density of 10 μW/cm3. Its energy density was 3.3 kilowatt-hours/kg. The half-life of nickel-63 is 100 years.
So for 1 kg you get 3300 wh of total energy. But you can only extract that during 100 years. Or do they have some kind of throttlig mechanism to increase power output.
From my understanding if a battery is a jug with a tap on it this thing is a barrel with a tiny hole in it.
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