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@gbj_tester
Battery drain shouldn't be higher at low ambient temperature, but battery performance is severely affected. At some point, the effective internal resistance rises to such a high level (because the chemistry rate can't keep up with the current drain) that the terminal voltage will drop to a level the circuitry regards as dead. This is why Arctic explorers like external battery packs for their cameras, so they can have the battery under the thermal insulation layers of their clothing.