Good Quality 2600mAh 3.7V Lithium-ion Battery is a rechargeable battery with a high capacity and high discharge rate. It is utilized in high-drain applications. The first four numbers of 18650 represent its size, which is 18mmx65mm, while the fifth digit represents its shape. Cylindrical Li-Ion Battery with no memory effect and longer storage life than NiMH battery, lighter weight, and higher energy density than any other rechargeable battery. It has a 2600mAh High Capacity, High Energy Density and Low weight compared to other rechargeable batteries Battery based on International Electro-Technical Commission (IEC) standard Testing to ensure capacity, quality, and lifespan.