Battery Warnings

At 18650Battery.com, safety is our top priority. Lithium-ion batteries are powerful energy storage devices, but improper handling, storage, or use can lead to serious risks, including fire, explosion, or injury. You must read and follow these safety guidelines carefully to ensure safe usage.

Understanding the Risks: Short Circuits

A short circuit occurs when the positive (+) and negative (-) terminals of a battery come into direct contact, creating a high-current flow with no resistance. This can result in:

  • Extremely high temperatures
  • Fire or explosion risks
  • Personal injury, property damage, or even death

Important: While the top cap is the positive terminal, the entire body of a cylindrical lithium-ion battery acts as the negative terminal. Proper insulation is critical to preventing short circuits.

What is Thermal Runaway?

Thermal runaway is a serious condition in which a battery generates excessive heat, triggering a chain reaction of heat production that can lead to fire or explosion.

Causes of Thermal Runaway

  • Overcharging: Exceeding the battery's maximum voltage can result in overheating.
  • Short Circuits: Internal or external short circuits rapidly generate heat and pressure.
  • Physical Damage: Cracks, dents, or punctures in the battery’s casing can compromise safety.
  • Exposure to High Temperatures: Operating or storing batteries in environments that exceed recommended temperature limits can destabilize the internal structure.

Signs of Thermal Runaway

  • Unusual Smell: The battery emits a chemical or burning odor.
  • Swelling or Deformation: The battery casing appears bloated or misshapen.
  • Smoke or Heat: The battery becomes excessively hot, emits smoke, or leaks.

Preventing Thermal Runaway

  • Always use a smart charger designed for the specific battery type.
  • Do not charge or discharge the battery outside the manufacturer’s specified voltage and current limits.
  • Keep batteries away from high heat, direct sunlight, or flammable materials.
  • Inspect batteries regularly for signs of damage or wear before use.

Responding to Thermal Runaway

If you notice any signs of thermal runaway:

  1. Immediately stop using the battery and place it on a non-flammable surface (e.g., concrete or sand).
  2. Move the battery away from flammable materials.
  3. Allow the battery to cool naturally; do not attempt to move or handle it while it is overheating.
  4. If the battery ignites, use a Class D fire extinguisher or sand to extinguish the fire. Never use water or a regular fire extinguisher.

Key Safety Instructions

General Handling

  • Inspect Before Use: Do not use a battery if it is dented, deformed, leaking, or missing its protective PVC wrapper or top cap insulator.
  • Avoid Metal Contact: Always store batteries in protective cases. Never carry loose batteries in a pocket, purse, or bag where they may contact metal objects like keys or coins.
  • Protect Insulation: Ensure the PVC shrink wrap and insulator are in perfect condition at all times.

Charging Safety

  • Use only smart chargers specifically designed for lithium-ion batteries.
  • Never overcharge or exceed the battery’s maximum voltage rating.
  • Charge on a fire-proof surface and never leave batteries unattended while charging.
  • Stop charging immediately if the battery emits an unusual smell, feels hot, or appears abnormal.

Storage and Transportation

  • Store batteries in the boxes or cases they were delivered in or other approved battery cases.
  • Keep batteries in a cool, dry place, away from direct sunlight, liquids, or high temperatures.
  • Always keep batteries out of reach of children and pets.

Prohibited Activities

DO NOT:

  • Use the battery if damaged in any way.
  • Short-circuit the battery, intentionally or unintentionally.
  • Expose the battery to liquids, high heat, or open flames.
  • Disassemble, puncture, crush, or modify the battery.
  • Solder directly onto the battery (spot welding only).
  • Use mismatched batteries (e.g., different brands, models, or charge states).
  • Dispose of batteries in regular trash—always recycle responsibly.

Emergency Response

  • Skin/Eye Contact: If battery electrolyte comes into contact with skin or eyes, flush with water immediately and seek emergency medical attention.
  • Battery Fire: Use a Class D fire extinguisher or sand to extinguish lithium-ion battery fires. Do not use water or a standard fire extinguisher.

Specific Product Warnings

  • For System Integrations Only: Lithium-ion batteries are intended for use in protected battery packs with proper protection circuitry (e.g., BMS or PCB).
  • NOT FOR E-CIGARETTES OR VAPORIZERS: Lithium-ion batteries are not designed for use in e-cigarettes, vaporizers, or similar devices. Using them in such applications poses a significant risk of fire or explosion.

Legal and Liability Disclaimer

  • The user assumes all risks associated with the handling and use of lithium-ion batteries.
  • Batteries must only be used in applications for which they are designed and approved.
  • Resellers are required to forward all warnings to customers. 18650Battery.com is not responsible for misuse, improper handling, or failure to follow safety guidelines.

Manufacturer Safety Resources

For more information, please consult the following resources provided by manufacturers:

    Your Responsibility

    By adhering to these guidelines, you can reduce the risks associated with lithium-ion batteries and use them safely and effectively. If you have any questions or concerns, please contact our team for additional guidance.

    Stay safe and use your batteries responsibly!