Lithium Battery Safety: How to Charge, Store and Recycle Batteries

Lithium battery safety matters because lithium-ion batteries power smartphones, laptops, wireless earbuds, handheld gaming systems, controllers, speakers and power banks. Although these batteries safely power millions of everyday devices, physical damage, excessive heat, incompatible charging equipment or improper storage can increase the risk of overheating and fire.

This JenDore Tech Lab guide explains how lithium batteries work, how to recognize battery damage, how to charge and store lithium-ion batteries safely, and what to do with swollen, damaged or used batteries.

What Is a Lithium Battery?

"Lithium battery" describes several types of batteries that use lithium in their chemistry.

Lithium-metal batteries are generally non-rechargeable. Some coin and button-cell batteries are examples.

Lithium-ion batteries are rechargeable and are commonly found in phones, computers, gaming devices, power banks and other portable electronics. Lithium-polymer batteries are a type of rechargeable lithium battery often used in thin or lightweight devices.

Inside a lithium-ion battery, charged particles move between internal components as the battery charges and discharges. A separator keeps the positive and negative sides apart. Physical damage, defects, excessive heat or improper charging can cause the battery to overheat.

Why Can Lithium Batteries Become Dangerous?

A damaged or malfunctioning lithium-ion battery can experience thermal runaway—a rapid self-heating reaction that may produce extreme heat, smoke, fire or flammable gases.

Risk may increase when a battery is:

• Crushed, punctured, bent or severely dropped
• Exposed to excessive heat or direct sunlight
• Charged with incompatible or damaged equipment
• Modified, opened or improperly repaired
• Defective or included in a safety recall
• Used after swelling, leaking or overheating
• Stored where its terminals can touch metal

Properly manufactured batteries normally work safely when used according to the manufacturer's instructions.

Lithium Battery Warning Signs

Stop using or charging a battery-powered device if you notice:

• Swelling or bulging
• A device case separating at its seams
• Leaking, corrosion or unusual residue
• Hissing, popping or crackling
• An unusual chemical odor
• Smoke or vapor
• Melting or discoloration
• Excessive heat during normal use
• A sudden, unexplained change in performance

⚠️ Never puncture, crush or attempt to flatten a swollen battery. Do not charge it again to see whether it still works.

⚠️ If a device is smoking, burning or making alarming sounds, move away, alert others and call 911. Do not risk injury by attempting to carry a burning or severely overheating device.

How to Charge a Lithium-Ion Battery Safely

Use compatible equipment

Use the charger provided with the product or one approved or recommended by its manufacturer. The connector, charging standard, voltage and current must be compatible with the device.

A reputable higher-wattage USB-C charger is not automatically unsafe when the charger and device support proper power negotiation. However, damaged, counterfeit, incompatible or poorly manufactured chargers may create unnecessary risk.

Inspect chargers and cables

Do not use equipment with exposed wires, bent prongs, loose connectors, damaged housings or burn marks. Replace cables that are frayed, crushed or unusually hot. Learn more in our JenDore Tech Lab guide, "When Should You Replace a Charger or Charging Cable?"

Allow heat to escape

Charge devices on stable, uncovered surfaces. Do not charge a phone, power bank or gaming device under a pillow, blanket, clothing or anything else that can trap heat.

Avoid heat and moisture

Keep charging devices away from heaters, stoves, direct sunlight and wet surfaces. Never leave batteries or battery-powered devices in a hot vehicle.

Watch for problems

Follow the manufacturer's charging instructions. Disconnect the device if it begins swelling, producing an unusual odor or becoming abnormally hot. Do not charge a damaged device.

How to Store Lithium Batteries Safely

• Choose a cool, dry location.
• Keep batteries away from sunlight and heat sources.
• Protect them from crushing, punctures, water and impacts.
• Keep loose batteries away from keys, coins and jewelry.
• Use original packaging or an appropriate protective case.
• Keep batteries away from flammable materials.
• Store them out of reach of children and pets.
• Follow manufacturer instructions for temperature and charge level.
• Inspect stored products periodically for damage.
• Separate damaged batteries from usable products.

Loose battery terminals can short-circuit when they contact metal. When preparing batteries for recycling, the U.S. Environmental Protection Agency recommends placing each battery in a separate plastic bag or covering its terminals with non-conductive tape. Always follow the recycler's instructions.

What Should You Do With a Damaged Lithium Battery?

Do not place lithium-ion batteries in household trash or curbside recycling bins. Collection and sorting equipment can crush or puncture batteries, potentially causing fires.

Take intact used batteries to an approved battery or electronics recycling program.

Damaged, swollen, leaking, recalled or hot batteries may require special handling. Contact the manufacturer, retailer, local household hazardous-waste program or fire authority for instructions. Clearly explain that the battery is damaged before transporting it.

Do not mail or ship a damaged lithium battery unless all applicable carrier and hazardous-material requirements are being followed.

If leaking material contacts your skin or eyes, move away from the battery and follow the manufacturer's emergency instructions. In the United States, contact Poison Control at 1-800-222-1222 or seek medical assistance when appropriate.

Can Lithium Batteries Go in the Trash?

No. Lithium-ion batteries should not be placed in household trash or curbside recycling containers. Collection and sorting equipment can crush or puncture batteries and potentially cause fires.

Take intact used batteries to an approved battery or electronics collection location. Disposal requirements vary by location, so contact your local household hazardous-waste program or an approved recycler before bringing in a damaged battery.

Is a Swollen Lithium Battery Dangerous?

A swollen battery should be treated as damaged. Stop using and charging the affected device. Do not press on, puncture, bend or attempt to flatten the battery.

Contact the manufacturer, an authorized repair provider, a household hazardous-waste program or your local fire authority for handling instructions. If the device is smoking, burning or making alarming sounds, move away and call 911.

Can You Use a Higher-Wattage USB-C Charger?

A higher-wattage USB-C charger can be safe when the charger and device support compatible power-delivery standards and proper power negotiation. The device generally draws the amount of power it supports rather than automatically accepting the charger's maximum output.

However, the USB-C connector alone does not guarantee compatibility. Follow the device manufacturer's recommendations and avoid counterfeit, damaged or poorly manufactured chargers.

Quick Safety Checklist

Before charging or using a battery-powered product, ask:

• Is the battery swollen, cracked, leaking or unusually hot?
• Are the charger and cable undamaged and compatible?
• Is the device on an uncovered surface?
• Is it away from bedding, paper, clothing and heat?
• Has the product been recalled?
• Do I know where to recycle it?

If something looks, smells, sounds or feels wrong, stop using the product.

Use Everyday Technology More Safely

Lithium-ion batteries make portable gaming, communication and entertainment possible. Consumers do not need to fear them, but they should treat them carefully.

Use reliable products, follow manufacturer instructions, keep charging areas clear, protect batteries from damage and recycle them properly. These habits can help protect your devices, property and the people around you.

Visit JenDore Tech Lab for practical guidance about batteries, chargers, charging cables, power banks and everyday technology.

Sources

• U.S. Environmental Protection Agency — Frequent Questions: Lithium-Ion Batteries
• U.S. Environmental Protection Agency — Used Lithium-Ion Batteries
• U.S. Consumer Product Safety Commission — Battery Safety
• Pipeline and Hazardous Materials Safety Administration — Lithium Batteries

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Disclaimer: This article provides general educational information. Follow the instructions provided by the product manufacturer and the guidance of local emergency, recycling and government authorities.

Published by JenDore Tech Lab
Last updated: September 2026