18650 RS25 Hercules Fumytech has a capacity of 2500 mAh and 20A in discharge rating for the use of being used with regulated mods and mechanical mods. The RS25 has Lithium-Ion chemical for minimal auto discharge The Fumytech batteries have undergone extensive testing are reputed for their reliability, with useful information is indicated on the protective sheath of the battery, maximum power, limited value of the coil, etc?