Safe Storage of Lithium-Ion Batteries
Protect People, Property, and the Environment
Lithium-ion batteries power equipment ranging from smartphones and laptops to power tools, electric vehicles, and industrial machinery. Although these batteries generally operate safely when used correctly, damage, defects, excessive heat, or improper charging can create fire, explosion, and hazardous-gas risks.
This guide explains common lithium-ion battery hazards and provides practical considerations for storing, charging, inspecting, and handling batteries in the workplace. Because risks vary by battery type, condition, energy capacity, quantity, and application, storage practices should be based on the manufacturer’s instructions and a facility-specific hazard assessment.
Lithium-Ion Battery Safety: Risks, Regulations, and Smart Storage Solutions
How a lithium-ion battery works
Knowing how lithium-ion batteries function is essential before understanding their risks. Though compact and efficient, a battery's internal components operate under tightly controlled chemical and electrical conditions. When these conditions are disrupted, the results can be dangerous, even slightly. Knowing how a battery is built provides key insight into why failures such as overheating, short-circuiting, or deep discharge can lead to fires, explosions, or chemical leaks.
Each lithium battery cell contains:
An anode and a cathode
An electrolyte that carries lithium ions
A separator that keeps the electrodes apart while allowing ions to pass
During discharge, lithium ions move from the anode to the cathode while electrons travel through the external circuit to power the connected device. During charging, this process is reversed.
Damage, manufacturing defects, excessive heat, or improper charging can compromise the separator or other internal components. This may cause an internal short circuit, overheating, or thermal runaway.
The Real Risks of Lithium Batteries: Fire & Chemical Hazards
Lithium-ion batteries can pose fire, explosion, and chemical exposure hazards when damaged, defective, improperly charged, or exposed to unsuitable conditions. The severity of a failure depends on factors including battery chemistry, design, energy capacity, state of charge, condition, and surroundings.
In this section, we break down the most common and dangerous failure modes, so you can better understand why proper storage and handling are essential.
Thermal Runaway
Thermal runaway is an uncontrolled self-heating reaction within a battery cell. It can result in venting, fire, rupture, or explosion and may spread from one cell to adjacent cells.
Deep Discharge
Extended storage without appropriate maintenance can allow some batteries to discharge below the manufacturer’s recommended voltage. A deeply discharged or otherwise compromised battery should not be recharged unless permitted by the manufacturer.
Mechanical Damage
Dropping, crushing, puncturing, or striking a battery can damage internal components and cause a short circuit. The resulting failure may occur immediately or develop later.
Hazardous Gases and Vapors
A failing or burning lithium-ion battery can release flammable and hazardous gases and vapors. The substances produced depend on the battery chemistry and the conditions of the incident. Personnel should avoid exposure and follow the facility’s emergency procedures.
Smart Storage for Lithium-Ion Batteries: Protect Your Facility, Safeguard Your Team
The use of lithium-ion batteries is growing across industries, but so are the risks. Fires caused by improper storage or handling can spread rapidly and are difficult to extinguish. In addition to fire, batteries can release toxic gases like hydrofluoric acid during failure, endangering employees and damaging sensitive infrastructure.
Protecting your people, property, and operations begins with proper storage practices and purpose-built safety solutions.
Responding to Lithium-Ion Battery Fires
Lithium-ion battery fires should not automatically be treated as Class D combustible-metal fires. Class D agents are intended for burning metals, while most lithium-ion batteries contain lithium compounds rather than metallic lithium.
A battery incident may involve electrical hazards, flammable gases, intense heat, reignition, and propagation between cells. The appropriate response depends on the battery chemistry, size, configuration, location, and stage of failure.
Facilities should establish an emergency response plan in consultation with the local fire department, fire protection professionals, the authority having jurisdiction, and the battery manufacturer. Employees should be trained to recognize warning signs, activate alarms, evacuate when required, and avoid attempting suppression unless they have been specifically trained and equipped to do so.
Any fire-protection or suppression system should be selected for the specific battery hazard and facility conditions. Do not rely on generic Class D powders or granules unless their suitability for the particular application has been confirmed by a qualified fire-protection professional.
Loss Prevention Best Practices
Avoid excessive heat
Avoid short circuits
Use only suitable chargers
Follow charging limits
Prevent physical damage
Because lithium-ion battery hazards vary by product and application, storage and charging procedures should be based on the manufacturer’s instructions and a workplace hazard assessment.
Recommended precautions include:
Use only chargers approved by the battery or equipment manufacturer.
Inspect batteries and chargers before use.
Protect battery terminals from contact with conductive materials.
Prevent batteries from being dropped, crushed, punctured, or otherwise damaged.
Keep batteries away from direct sunlight, excessive heat, ignition sources, and combustible materials.
Store and charge batteries within the manufacturer’s specified temperature range.
Do not charge batteries showing swelling, leakage, unusual heat, odor, discoloration, deformation, or other signs of damage.
Establish a separate procedure and designated isolation area for damaged, defective, or recalled batteries.
Train employees to recognize warning signs and follow the facility’s emergency-response plan.
The quantity, energy capacity, condition, and state of charge of the batteries should be considered when determining appropriate storage arrangements and fire-protection measures.
Lithium-Ion Battery Storage and Charging Cabinets
DENIOS offers purpose-designed cabinets for storing and charging lithium-ion batteries indoors. Available configurations include full-height one-door and two-door cabinets, along with compact underbench models for facilities with limited space.
Storage-only cabinets are intended for battery storage. Storage and charging models include electrical outlets and monitoring features for charging batteries inside the cabinet. Available features vary by model, so the selected cabinet should match the intended use, battery inventory, and facility risk assessment.
Current full-height configurations include:
One-door cabinets with four shelves
Two-door cabinets with three shelves
Storage-only and storage-and-charging models
A two-door charging model with an integrated fire-suppression system
Additional shelves available separately
Shared full-height cabinet features include:
90-minute fire resistance
Lockable doors
Lock-status indicator
Insulated storage levels
Bottom collection sump
Integrated transport base for relocation during an incident
Applicable full-height cabinets are certified in accordance with VDMA 24994:2024-08. This certification does not apply to the underbench models.
The Lithium Storage Cabinet has these basic features:
- 90 minutes fire protection
- Stable, high-quality and scratch-resistant outer shell
- Lockable doors by means of profile cylinders
- Integrated lock status indicator (red / green)
- Integrated transport base with optional plinth panel
- Bottom tray
Frequently Asked Questions About Lithium-Ion Battery Storage
What are the risks of storing lithium-ion batteries?
Improper storage can lead to fires, explosions, toxic gas release, and structural damage due to overheating, physical damage, or internal battery failure.
What is thermal runaway in lithium-ion batteries?
Thermal runaway is a chain reaction where heat builds uncontrollably inside the battery, potentially causing it to ignite or explode.
Can lithium-ion batteries catch fire on their own?
A lithium-ion battery can enter thermal runaway without exposure to an external flame if it is damaged, defective, improperly charged, short-circuited, or exposed to excessive heat. Warning signs may include unusual heat, swelling, leakage, odor, discoloration, or noise.
How should I store lithium-ion batteries safely?
Follow the battery manufacturer’s storage instructions, including specified temperature and state-of-charge limits. Protect batteries from physical damage, terminal short circuits, heat, moisture, ignition sources, and combustible materials. Workplace storage arrangements should be based on the battery inventory and a facility-specific hazard assessment.
Do lithium-ion batteries emit toxic gases when damaged?
Yes. Failing batteries can release hazardous vapors such as hydrofluoric and hydrochloric acid, which pose health risks through skin contact or inhalation.
What is the best way to store damaged lithium-ion batteries?
Do not place a damaged, defective, or recalled battery into routine storage or continue charging it. Isolate it from combustible materials using a designated procedure and location appropriate for the hazard. Follow the manufacturer’s instructions and applicable transportation, recycling, and disposal requirements.
Are there regulations for lithium-ion battery storage?
No single federal regulation covers every workplace lithium-ion battery storage situation. Depending on the application, requirements may include OSHA workplace safety rules, U.S. Department of Transportation hazardous materials regulations, applicable fire and building codes, and requirements established by the local authority having jurisdiction.
What is a Lithium-Ion cabinet by DENIOS?
The Lithium-Ion Battery Cabinet is a fire-rated storage cabinet designed for lithium-ion batteries. Available DENIOS lithium-ion cabinets provide 90-minute fire resistance to help contain fire exposure and provide additional time for evacuation and emergency response. Explore our selection guide to learn more!
Why should I choose DENIOS for battery storage?
DENIOS offers expert-engineered storage solutions backed by 30+ years of experience in hazardous materials safety, ensuring full compliance and peace of mind.
How long can lithium-ion batteries be stored safely?
There is no universal safe-storage period. Storage life and required maintenance depend on the battery chemistry, condition, age, state of charge, temperature, and manufacturer’s instructions. Batteries in long-term storage should be inspected and maintained at the intervals specified by the manufacturer.
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