18650 RS30 Hercules Fumytech has a capacity of 3000 mAh and 20A in discharge rating for the use of being used with regulated mods and mechanical. The RS30 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?