My $0.02 on the issue. Don't buy batteries on eBay, too easy to get fakes. I'll second the recommendation to move up to 18500 size batteries if you really want to go sub ohm.
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While I've had a couple of incidents with fakes on Ebay, I just wanted to throw my two cents in as well. I get a LOT of GREAT deals on Ebay! Their money back guarantee makes it very unlikely that you'll get screwed if you stick to sellers with EXCELLENT feedback scores! A lot of Vape shops and suppliers have taken to Ebay to get rid of overstock and keep overhead down so excluding it from your list of trusted vendors could be a COSTLY choice! You may have to deal with the hassle of going through the resolution center and waiting a few weeks, but trust me, even jerks want to be able to keep selling on there, and losing out on ONE sale vs. potential thousands, just ISN'T worth it to them to NOT work something out that will be beneficial to you! Even when I've had honest mistakes turn out, I've ended up coming out AHEAD, as they wanted that POSITIVE feedback!
My motto is WHY pay FULL PRICE when you don't have too, plus my trusted sellers on there offer FREE EXPEDITED shipping!!! Also I concur regarding the Efest, that's what I use and got them off of Ebay. I also get some of my batts from Amazon and some from Fasttech. I REALLY was impressed with the ones from FT given the price I've paid. I don't use them for Sub-ohm vaping but they work EXCELLENT for my needs and CAN'T beat the price, and I really like the plastic case they come in vs. the plastic bags and padded boxes all of my others have come in. Hope I've helped some!