Heat2go Thermal replacement battery

Interchangeable without having to take off the thermo articles. Light weight, ideal to always have a 2nd pair with you. Weight: 59 g/piece. Content: 2 pieces. 2 lithium polymer batteries: 3800 mAh each, 3.7 V, 14.06 Wh. No memory effect. Charging time: approx. 9 hours.