The ER18505 FL battery is a lithium-ion battery with3.6V voltage and a capacity of 4,000mAh. It has 150mm long circuit leads, Ø18.7x50.5mm in diameter, and 18505 type terminals. It is manufactured by Eve Battery. This battery is suitable for a wide variety of medium-to-high-power applications, such as portable electronics, medical devices, LED lighting, renewable energy sources, robotics, and more. It is also designed to offer reliable and consistent power, while also being environmentally friendly.