Charging a smartphone in freezing temperatures can cause irreparable damage to its battery — equivalent to losing dozens of charge cycles at once. Repair specialist Mikhail Demidov warned that in winter, any charging operations should be postponed until the device is brought back to a warm environment.

Why Charging in the Cold Destroys the Battery

Lithium-ion batteries are extremely sensitive to low temperatures. When a cold battery is charged, undesirable chemical reactions begin inside: lithium crystallizes on the anode, forming dendrites. This leads to an irreversible loss of capacity — sometimes up to 20–30% in a single charging session. In the worst cases, the battery can swell or fail completely.

If a smartphone runs out of power outdoors, Demidov advised going indoors and waiting at least 15 minutes before connecting it to a power outlet or power bank. During this time, the device warms up to a safe temperature, minimizing the risk of damage.

General Rules for Using Devices in Winter

The key rule is to prevent severe cooling. Do not leave smartphones, tablets, or laptops outside for long periods, in unheated rooms, or in cars parked overnight in the cold. Temperatures below –10°C (14°F) are already critical for most electronics.

To protect devices from the cold, use thick cases — silicone, leather, or plastic — as they slow down heat loss and reduce temperature fluctuations. Keep your phone in an inner jacket pocket, closer to your body, where body heat maintains a stable temperature.

Limit outdoor use of gadgets. It’s better to make calls or send messages via a headset and quickly put the phone away. Laptops and tablets should only be used in cold weather when absolutely necessary, since their batteries and screens are even more vulnerable.

How to Bring Devices Back Indoors Safely

After being outdoors in freezing temperatures, do not switch the device on immediately. Allow it 15–20 minutes to warm up gradually at room temperature. A sudden start can cause condensation to form inside the case, leading to corrosion or short circuits.

Smartwatches require particular care. For those who enjoy winter sports, Demidov recommended wearing them under clothing — beneath a jacket sleeve or inside a glove. Protective covers can also prevent frost buildup and help retain warmth.

In Brief…

Charging a smartphone in the cold can ruin its battery — with up to 30% capacity lost in a single session. Always wait 15 minutes in the warmth before plugging it in. Avoid leaving devices in freezing temperatures, keep them in protective cases close to your body, and minimize outdoor use. After exposure to the cold, let devices warm up for 15–20 minutes before turning them on. Keep smartwatches under clothing for extra protection. Winter 2025 will show: those who follow these rules won’t end up paying for repairs.