I only have one set of Efest 18650 2000 mAh Flat Top High Drain IMRs. I have seen that there are many that disagree with purchasing on ebay, but I got these two from ebay and they are fine. I have had good luck with stuff on ebay, but I do feel as of now that some things need to be purchased from 'reputable' dealers. So...batteries are one of those "some things". Here is my confusion and question. The Panasonic NCR18650PF Hybrid 2900 mAh Flat Top, Efest Purple IMR 18650 2500 mAh 35 amp Flat Top or the AW IMR 18650 2000mAh. Correct me if I'm wrong, but I believe these are all High Drain. So which would be best for my Vamo V5?