Use the charger and instructions made for the device

The U.S. Fire Administration (USFA) advises following product instructions, handling batteries carefully, and recycling them through local channels. Health Canada specifies using a compatible charger and following the manufacturer’s directions for use, charging, and storage. Do not improvise a battery-and-charger combination or open and modify a battery pack. Phones, laptops, e-bikes, and tools can use different battery designs and charging requirements, so generic advice cannot replace the product instructions.

Choose a visible charging place and watch for damage

Health Canada recommends charging at room temperature where the device can be seen, away from soft furnishings that trap heat and away from exit doors. A swollen or dented pack, torn wrapper, or leakage is a reason to stop using it and contact the manufacturer or an authorized service provider; do not keep charging a suspect battery. If a device becomes unusually hot, smells, makes odd sounds, or emits smoke, do not handle or dismantle it. Move people to safety and follow local fire-service instructions.

Store and dispose of batteries locally and safely

For batteries kept out of use, Health Canada advises a dry place away from direct sun, extreme temperatures, moisture, and flammable materials. Its guidance is written for Canadian consumers, so collection points and disposal rules should be checked with the local authority where you live. USFA says not to put lithium-ion batteries in household trash and points consumers toward local recycling locations. Some programs require terminals to be protected; ask the receiving facility before transporting a damaged pack or attempting any preparation yourself.

Expert perspective: fire-service guidance and its limits

USFA and Health Canada offer consumer prevention guidance on device use, charging, storage, and fire risk. They do not establish one charging duration that is safe for every battery or promise that following a checklist eliminates fire risk. Large e-bike packs, home energy-storage systems, and batteries damaged by impact or flooding can have different handling requirements from small electronics. Check product recalls and manufacturer instructions. If a battery is smoking or burning, evacuate and call local emergency services rather than attempting to fight the fire yourself.

UL Research Institutes explains the mechanism behind the official precautions: an internal short, overcharge from an incompatible charger or poor battery-management controls, and extreme temperatures are among conditions that can initiate thermal runaway. In that uncontrolled self-heating state, a cell may vent, smoke or burn. This is an explanation of possible failure paths, not a way to certify an apparently undamaged pack as safe or to assign an incident probability to a product. Follow USFA and Health Canada for consumer handling and evacuation advice.

Sources and references: Battery Fire Safety | U.S. Fire Administration / Battery safety: Lithium-ion batteries | Health Canada / What Causes Thermal Runaway? | UL Research Institutes