09/20/2026
Lithium-Ion Battery Safety: Know the Warning Signs
This past week our crews responded to an incident involving multiple lithium-ion batteries that were overheating and expanding. Thankfully the facility that these batteries were located in consistently checks their equipment, knew the signs of battery failure and took the appropriate actions. Once on scene our crews were able to safely remove the batteries from the structure and secure them in an approved containment system with cellblock before a more significant thermal runaway event occurred.
Lithium-ion batteries are found in everything from power tools and e-bikes to phones, laptops, scooters and other everyday devices. While they are extremely useful, damaged or improperly handled batteries can present a serious fire hazard.
Know the warning signs:
🔋 Excessive heat
🔋 Swelling or bulging
🔋 Cracks or physical damage
🔋 Unusual odors
🔋 Hissing, popping or other unusual sounds
🔋 Smoke or visible gas/venting
🔋 Changes in color or appearance
If you notice any of these warning signs, stop using the battery and move people away from the area. Do not attempt to continue charging or using a battery that appears damaged or is overheating.
To help prevent battery failures:
• Use the charger and battery recommended by the manufacturer
• Don’t use damaged or modified batteries
• Charge batteries on a hard, noncombustible surface
• Keep batteries away from combustible materials and extreme temperatures
• Don’t charge batteries under beds, pillows or blankets
• Don’t leave batteries charging unattended
• Store spare batteries where they cannot be damaged or short-circuited
• Recycle lithium-ion batteries through an appropriate battery-recycling program — never place them in household trash
A few minutes of prevention can prevent a battery failure from becoming a fire.
If you use lithium-ion batteries in your home, workplace or business, take a few minutes to inspect them today. Know what you’re looking for, know how to store them properly, and most importantly, know when a battery is no longer safe to use.