Hand Warmers: Battery Safety & IP Ratings
Understanding safety certifications and water resistance
Battery Safety Certifications
Rechargeable hand warmers use lithium-ion batteries, typically 5,000-10,000mAh. Look for UL or CE certification for safety. TSA allows batteries under 100Wh in carry-on luggage. Always check airline policies before travel.
Key Tips:
- Under 100Wh is TSA-approved for carry-on
- UL/CE certification = safety tested
- IPX4 = splash-resistant
- IPX5+ = rain-resistant
- Charge with original cable when possible
IP Ratings Explained
IP ratings indicate water resistance levels. IPX4 handles splashes, making it suitable for light snow or occasional moisture. IPX5 withstands rain and is better for outdoor winter activities. Higher ratings like IPX7 indicate full water immersion protection.
Travel Considerations
Most hand warmers fall within TSA guidelines (under 100Wh), but it's always wise to keep them in carry-on luggage and have documentation of battery capacity if questioned. Some airlines have stricter rules, so verify before flying.
Charging Safety
Always use the original charging cable or a certified replacement. Avoid cheap third-party chargers that may not have proper safety features. Never leave hand warmers charging unattended overnight or in extremely cold/hot environments.