OCOOPA Modular Hand Warmers Rechargeable, 10000mAh Handwarmer, 15 Hrs Warmth, 4 Levels Electric Heater 145°F, USB-C Portable Charger, Perfect for Golf, Hunting Gifts Men, Union U5s

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*No Standalone lithium batteries are sold with the product. The world's first modular rechargeable hand warmer, the Ocoopa Union 5s, is composed of a Union core- 10000mAh battery bank and a Union case- heating housing. It enables you to replace the battery or heat casing as needed. In only three steps, you can alternate with a fully charged battery. Refill your hand warmer in seconds for another 15 hours of warmth. Swap and go. Heat that lasts for 15+ hours. Ocoopa Union 5s is equipped with a battery cell with a capacity of 10000mAh, leading in a 20% improvement in energy density and minor weight increases. It can deliver heat for up to 15 hours. Accompany you throughout the day. Faster Heat. Larger surface. Feel a comfortable warmth like you've never felt before. The U5s features a uni-body high grade brushed aluminum casing with a 30% bigger heat surface than previous. Spread the ideal warmth from your palm to your fingertips. You can always have your comfortable heat with four temperature ranges ranging from 145°F to pick from. Your must-have gadget for every season. During the summer, remove the Union case and use the Union core as a 10000 mAh USB-C portable charger. U5s is both a hand warmer and a portable power source!