... vest,heating clothes with hgih capacity battery pack 1)rechargable batteries 2)releases FIR radiant heat. ITEM :electric heating vest ... time: 5-20 (h)Product Certification: CEIllustration:1. Using rechargeable batteries, wich releases the far infrared (FIR)radiant heat to promoted ... and got arthritis.***** to Use: HBH-Smart Li-Polymer Batteries is Humanization design. There is only a output socket, ...