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). We recommend using a 2Amp charging block with the charging cable included. A colored LED light gauge on the battery pack indicates batte