Dude please report back if you can??? What box did you order the beast box mod or the the beast varicool 6amp mod????? Also I wante to let every one know that any mechanical mod that can stack 2 18350's can handle the hercules 7.4v attachment just be careful as there is no electronics and taking the battery voltage level to low can damage battery or in a worst case injure the user. Be careful at all times with unregulated devices,now we just need TET to release an adapter 3/8th to 510 to run the EO and LL cart's on these sick mods. The beast mod now seems to be more of a hybrid device, its VV up to 8.4 volts so it hits and acts as a mechanical device but yet is fully protected by the electronics. The herc may cause issues if incorrectly assembled and then tried to run it on a mechanaical mod might be bad, always check with a Variable voltage device with ohm reader or use a multimeter.