What is the optimal temperature range for charging the battery pack?
Longest life and best performance can be obtained if the battery pack is charged when the air temperature is between 65°F – 75°F (18°C– 24°C). DO NOT charge when the battery pack is below +40°F (+4.5°C), or above +104°F (+40°C), as this can prevent serious damage to the battery pack.
From the official Craftsman CMCE040 Soldering Iron manual, page 7
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