Here is the scoop on NiMH and cold:
Quote:
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"At cold temperatures of 32°F, 0°C NiMH rechargeable batteries lose at least 20% of their deliverable capacity without significant loss of voltage; at -20°C, they have lost 80%. Since cold NiMH batteries behave like batteries of lesser capacity, be prepared for reduced runtimes in freezing conditions. Carrying extra sets of batteries in a warm pocket is a must with NiMH in the cold. When the cold batteries in the camera fail, switch to a warm set. Once the cold set has warmed up, its residual capacity will be ready to tap."
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So yes, they lose deliverable capacity in cold weather....