Reviewed September 20, 2026
Lithium-ion batteries store substantial energy and can overheat, ignite, or explode when they are defective, damaged, modified, charged incorrectly, or used with incompatible equipment. Risk can be reduced by following the device manufacturer's instructions and current public-safety guidance, but no battery should be described as fireproof or risk-free. The FDNY lithium-ion battery safety hub explains that these batteries can become defective and overheat, catch fire, or explode; the U.S. Consumer Product Safety Commission's micromobility guidance explains how correct charging, battery replacement, and disposal choices can reduce risk.
If a battery is smoking or there is a fire, leave immediately, close the door behind you if it is safe to do so, and call 911 from a safe location. Do not delay evacuation to troubleshoot the device or improvise a firefighting method. FDNY's apartment-building guidance emphasizes leaving, closing the door, and calling 911. See the FDNY 2025–2026 Fire and Emergency Preparedness Bulletin.
What can make a micromobility battery hazardous?
A battery problem may begin with a defective or damaged pack, an impact, an unqualified repair or modification, an incompatible charger, an unsuitable replacement battery, or charging practices that do not follow the manufacturer's instructions. CPSC says not to use a pack that has been modified or reworked by unqualified personnel and to use only a replacement or secondary pack that the device manufacturer has confirmed is suitable. Read the CPSC guidance.
A connector that physically fits is not proof that a charger is electrically compatible. CPSC warns that chargers marketed as “universal” may still be incompatible with a particular battery and can cause it to ignite. Use the charger supplied with the device or one the device manufacturer specifically recommends for that exact device. Read CPSC's universal-charger warning.
Before charging: inspect the device and the area
Before plugging in, check the device, battery enclosure, charger, cable, plug, and charging connector. Stop and seek guidance if the pack or device has been in a crash, suffered an impact, been exposed to water beyond the manufacturer's limits, or shows possible damage. Do not start or continue charging when there is overheating, smoke, an unusual odor, leaking, swelling, an unexpected change in shape or color, odd noises, a damaged cable or connector, or other abnormal behavior. FDNY directs users to stop using a battery and call 911 for warning signs including odor, shape or color changes, leakage, odd noises, visible damage, or an unqualified repair. See the current FDNY bulletin. EPA identifies swelling as battery damage and a potential fire hazard. See EPA's lithium-ion battery FAQ.
If there is no immediate emergency but damage or abnormal behavior is suspected, stop using and charging the device. Contact the device manufacturer or a qualified service provider for instructions specific to the model. Do not open, rebuild, repair, or transport a damaged pack based on a general internet guide.
During charging: stay present and protect the exit
- Follow the exact manual. Use the manufacturer's charging location, temperature, sequence, and storage instructions for the device.
- Remain present and awake. CPSC says never to charge a micromobility product while sleeping or when away from home. See CPSC's charging guidance.
- Keep the way out clear. Do not place a charging device where it could block an apartment door, window, hallway, or another exit. FDNY repeated in July 2026 that users should not block exits and should not charge overnight. Read the FDNY notice.
- Keep combustible materials away. FDNY says not to charge on or near a bed or couch, or close to drapes, paper, and other materials that burn easily. See the FDNY bulletin.
- For NYC apartments, plug directly into a wall outlet. FDNY says not to charge a lithium-ion battery with an extension cord or power strip. Follow the device manual and applicable building and local requirements. See the FDNY bulletin.
- Unplug when charging is complete. CPSC advises unplugging the device when done and not leaving the charger connected for long periods. See the CPSC charger warning.
For a short step-by-step routine, see How to Charge an Electric Scooter Safely.
Use only a confirmed-compatible charger and replacement pack
Use the charger supplied with the device or one specifically recommended by its manufacturer. If the original is missing, contact the device manufacturer and confirm the exact replacement before charging. Do not assume that a matching plug, voltage label alone, marketplace title, or broad “universal” description establishes compatibility.
Apply the same rule to replacement batteries. CPSC says a replacement or secondary pack should be tested and approved to work safely with the device and confirmed as suitable by the device manufacturer. Do not use repurposed cells or a pack modified or reworked by unqualified personnel. Read CPSC's battery guidance.
Why “fireproof” is not an acceptable battery description
“Fireproof” suggests that a battery cannot catch fire. That is not a responsible description of a lithium-ion battery. Safety-standard compliance, correct components, careful charging, and protective engineering can address specific hazards, but they do not make misuse, damage, defects, or fire impossible. FDNY states that even certified batteries can quickly become dangerous when they are not used or charged correctly. See the FDNY bulletin.
Damaged and end-of-life battery disposal
Never place a lithium-ion battery or a device containing one in household trash or curbside recycling. EPA says these batteries should go to a separate battery-recycling or household hazardous-waste collection point. A damaged battery needs case-specific handling: contact the device or battery manufacturer and the appropriate local waste program rather than improvising removal, packaging, or transport. Read EPA's used lithium-ion battery guidance.
Local rules and collection options differ. In New York City, FDNY directs residents to approved battery-disposal resources and states that rechargeable batteries may not be placed in trash or recycling. See FDNY's battery-safety and recycling information.
Quick prevention checklist
- Read and follow the exact device manual.
- Inspect the device, pack, charger, cable, and connector before charging.
- Use only a supplied or manufacturer-confirmed compatible charger.
- Use only a replacement pack confirmed suitable for the exact device.
- Charge while present and awake, with exits and combustible materials clear.
- Stop using and charging for damage or warning signs.
- For smoke or fire, leave, close the door if safe, and call 911.
- Use a proper battery-recycling or hazardous-waste route—never household trash or curbside recycling.
Official sources
- U.S. Consumer Product Safety Commission: Micromobility Information Center
- U.S. Consumer Product Safety Commission: Warning About “Universal” Micromobility Chargers
- FDNY: Lithium-Ion Battery Safety
- FDNY: 2025–2026 Fire and Emergency Preparedness Bulletin
- U.S. Environmental Protection Agency: Used Lithium-Ion Batteries
