As the topic says. I've got a Protank-2, with both original and Airflow control valve bases. I used it all last year on a Sigelei until that died, then went back to eGo batteries (with a mini Protank and EVODs). I'd like to use the big Protank since I have a collar for it, but when I put it on an eGo battery, the battery dies. Sometimes it'll give a hit or two, but still just dies. The battery seems fine after re-charging. I build my own Protank-2 coils and use the same heads in the small tanks and the big one. Any ideas?