The new battery is for 12V heated vests/jackets, not for 7.4V. It comes with a USB-C charging cable, no adaptor.
Specification: Name: 12V/5V Dual Voltage Output Li-Polymer Battery Model: YJ-665B Capacity: 14400mAh/55.44Wh Type-C input: 5V=3A, 9V=2.22A Max Type-C output: 5V=3A, 12V=1.5A, 9V=2.22A Max USB output: 5V=3A, 9V=2A, 12V=1.5A DC output: 12V=1.5A
These 2 modes (DC port and USB port) can not be used together. Which means if you are using this battery to power on the heated apparel, you can not use this as 5V power bank.
