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As for v0.2.3967, every battery is subject to normal drain and 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.
Battery cells act little different they skip pressure part, so only temperature matter. And no energy transfer occurs.