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As for v0.2.3967, every battery is subject to normal drain or conditional "cold" drain.
"Cold" drain occurs if pressure bellow armstrong limit(6.3KPa)(full drain) or below 0C(drain depends on temperature).
Normal drain amount - 10, "cold" drain amount - 50. If atmosphere is "indoor" then drained energy transfered to atmosphere.
Sealed vacuum is always take full "cold" drain amount, but open vacuum disable all drains(praise the Moon).
Battery cells act little different they skip pressure part, so only temperature matter. And no energy transfer occurs.