Keep your Snow Deer heated gear working all winter with these replacement batteries! This 2-pack of 7.4V 2200mAh lithium-ion batteries is exactly what you need for your heated gloves, socks, or hats when the original batteries start losing their charge. They take about 3-4 hours to fully charge using the proper Snow Deer charger (not included), and they provide reliable warmth for hours depending on your heat setting. The battery port is a female DC jack with 3.5mm outer diameter and 1.35mm inner diameter - make sure this matches your gear. Safety is important with these, so follow the guidelines: always use the original charger, don't expose to extreme heat or fire, remove from garments before washing, and keep away from flammable materials when charging. These batteries are UL and FCC certified, so you know they meet safety standards. If you're not using them for a while, remember to charge and discharge them every 3 months to maintain battery health. They're compatible with most Snow Deer heated products, providing that cozy warmth that makes winter activities so much more enjoyable. Whether you're skiing, snowboarding, working outside, or just dealing with cold commutes, having reliable batteries makes all the difference. No more cold fingers or toes when you've got fresh batteries powering your heated gear!