The N-Ferno 6495B Portable Battery Power Bank 7.2v/5000mAh is a compact and lightweight lithium-ion battery designed to charge the N-Ferno 6495 Rechargeable Heated Vest. Featuring a high capacity 7.2v/5000mAh battery, this battery pack charges quickly and offers all-day use when fully charged it takes approximately 4 hours to become fully charged. A colored LED light gauge on the battery pack indicates battery life, while the included USB-C cable makes for easy recharging. It is recommended that the battery is fully charged every 6 months, if not used on a regular basis.