Old smartphones and lithium-ion batteries could spark hidden fire risks at home

Old smartphones and electronic devices can pose hidden dangers if left unused for years. Lithium-ion batteries degrade over time, raising the risk of fires from heat, cold, or simple aging. Yet many people still store or discard these items without realising the potential hazards. Lithium-ion batteries become unstable as they age, especially when exposed to extreme temperatures. Storing them improperly—such as on flammable surfaces or near combustible materials—can increase fire risks. Experts recommend keeping batteries charged between 40 and 60 percent and storing them in a dry place, ideally between 0 and 45 degrees Celsius.

Leaving old smartphones unused for long periods can also be dangerous. Batteries may degrade to the point of failure, potentially causing overheating or fires. To prevent this, owners should occasionally recharge stored devices to avoid deep discharge. Disposing of electronics incorrectly adds further risks. Throwing them in household waste can lead to fires during processing and wastes valuable raw materials. In Germany, retailers, dealers, and supermarkets must accept old devices for free recycling. Alternatively, local recycling centres and collection points take batteries and accumulators. Before recycling, smartphones should be reset to factory settings to protect personal data. Some older tech may even hold value for collectors, offering an alternative to disposal.

Proper handling of old electronics reduces fire risks and recovers useful materials. Storing batteries correctly and recycling devices through official channels ensures safety and sustainability. With simple precautions, owners can avoid hazards while making the most of unwanted tech.