Black Squid Rechargeable Batteries for BlackSquid & Tomum Heated Socks - 3.7V 4000mAh Battery Replacement with Dual-Port Charging Cable (2 Pack)

High-Capacity Battery for Lasting Heat Each BlackSquid rechargeable battery provides up to 9 hours of warmth on low 6 hours on medium and 4 hours on high settings. Perfect for keeping feet warm during cold weather. Charge Two at Once Includes a dual-port USB Type-C cable to charge both BlackSquid rechargeable batteries simultaneously. Works with standard 5V/1A USB chargers for quick easy charging. Fits BlackSquid and Tomum Socks Compatible with BlackSquid Heated Socks and Tomum models using a 3.5mm round connector. Ideal for replacements or extra power on long trips. Consistent Power Output Each BlackSquid rechargeable battery delivers 3.7V at 2A with up to 8W output to maintain steady heat without interruptions. Compact and Portable Lightweight BlackSquid rechargeable batteries fit easily into heated sock compartments. Easy to carry for outdoor activities or travel. What's in the Box? 2 x 4000mAh Rechargeable Battery 1 x Type-C Charging Cable Specifications: Battery Capacity: 4000mAh Input: 5V / 1A Output: 3.7V / 2A Certifications: CE FCC ROHS