We designed this Smart lithium battery group sepcial for electric heating clothes, we own it’ s intellectual property. There is a microcomputer inside, to offer five level adjustable output power. We also designed safety control circuit to protect the hardware and sortware from over charge, over discharge, short circuit, over current. This battery group are satety and qulity reliablity. 1) Voltage: 7.4V 2) Capacity 4400mAh 3) Over charge protection voltage: 8.6V 4) Over-discharge protection voltage: 6.0V 5) Operation Current: less than 15mA 6) Standby current: less than 0.5mA 7) Output Power: 30W Max 8) Output efficiency: more than 98% 9) Pulse current output 10) Imedance: Electrical impedance3© -4K© 12) working time: 270 minutes to 900miuntes 12) battery size: 22mm* 87mm* 71mm 13) Net Weight: battery 235G Charger: 20g 14) Colour: white, milk white, yellow, silver gray, black , or costomized Note: Special Charger Matched