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I'm pretty sure Lithium batteries don't produce continuous power for 20 years...

• dogma1138 7y ago
  Non rechargeable cells can have that lifetime.
  • zaarn 7y ago
    I doubt at -40C to 80C.
    • dogma1138 7y ago
      Then you doubt for no reason these ones form Energizer are -40 to +60c.. https://data.energizer.com/PDFs/lithiuml91l92_appman.pdf https://data.energizer.com/PDFs/lithiuml91l92_appman.pdf And quick googling shows batteries with a wider positive range.
      • zaarn 7y ago
        If you scroll through that PDF you'll notice the temperature capacity chart. At -40°C you're going to have to limit your power drain a lot to get rated capacity. At low temperature the chemical reactions get too slow to take advantage of the full capacity of the battery, that's simply a reality you can't get around. A "betavoltaic" would deliver full rated capacity at any temperature, regardless of changes or duration.