Quick Answer
Rechargeable batteries lose 50% of their capacity after 3-5 days in temperatures below -20°C (-4°F), while single-use batteries can last around 1-3 days. Lithium-ion batteries are more affected than alkaline. In extreme cold, batteries may not discharge completely, but rather just lose capacity.
Battery Capacity Loss in Extreme Cold
Lithium-ion batteries are commonly used in modern gear, such as flashlights and GPS devices. In temperatures below -20°C (-4°F), these batteries can lose up to 50% of their capacity within 3-5 days. For example, a 2500mAh lithium-ion battery may only retain around 1250mAh after 3 days in extreme cold.
Charging and Discharging in Cold Temperatures
It’s crucial to note that lithium-ion batteries can become more prone to overcharging in cold temperatures. This can lead to reduced capacity, increased risk of explosion, or permanent damage. If you must use your gear in extreme cold, try to keep your batteries away from the device’s charging port.
Preparing for Cold Weather Use
To prepare your batteries for cold weather use, store them in a warm environment before heading out. Consider using thermal insulation or storing them in a warm pocket to keep them at a stable temperature. Avoid exposing batteries to extreme temperature fluctuations, as this can further reduce their capacity.
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