The 7.4-volt Plus Li-Ion is part of our new 2020 line of Micro USB charging Mobile Warming® batteries. The 7.4-volt Plus is our premium 7.4-volt battery featuring a larger milliamp hour capacity, enabling longer heat times and the capacity to target more heat zones than our 7.4-volt Standard battery. The 7.4-volt Plus also offers a built-in LED Flashlight and USB output to let you use your battery as a power bank to charge mobile devices. With over 15 years in the heated apparel industry, Fieldsheer® has focused on using only the highest quality Lithium-ion batteries to ensure long-lasting power and battery life. Our batteries are designed to power your Fieldsheer garment with Mobile Warming® Technology to give you hours of heat, ensuring you stay warm and comfortable.