• USB rechargeable Li-Ion batteries that provide up to 2.5 hours of heat on the low setting
• Works only with the Boss® Therm™ heated glove liner (399-HG20)
• Battery charge time: 2-2.5 hours

Keep your Boss® Therm™ heated glove liners powered up with this two-pack of USB rechargeable Li-Ion replacement batteries. Enjoy up to 2.5 hours of consistent warmth on the low setting, ensuring your hands stay comfortable during cold weather activities. These batteries are specifically designed to work with the Boss® Therm™ heated glove liner (model 399-HG20) and charge fully in just 2-2.5 hours, so you can get back to enjoying the outdoors sooner.