Buying from Amazon can be risky, especially if you purchase AW or Sony IMR batteries. Being so popular and highly recommended, there are many disreputable distributors who
make & sell counterfeit AW batteries. With the high amp Sony batteries becoming popular recently, these have become an
easy target for the counterfeiters, too.
"Battery counterfeiting: This is a growing problem and all APV users need to be aware of it.
This is what happens: the counterfeiters buy reject Li-ion batteries in bulk, strip the covers off, and re-cover them with labels that change them to look like popular brands. In this way they can take a cell bought for 10 cents, re-work it, and sell it as for example an AW battery with a retail price of $10. The profits are very high and this practice is growing. It means that you never really know what battery you have unless you buy from somewhere with a verified supply chain. For example, all AW batteries offered for sale on Alibaba are counterfeits, and possibly dangerous. -- Rolygate,
http://www.e-cigarette-forum.com/forum/ecf-library/129569-rechargeable-batteries.html
Many of the AW batteries sold on Ebay & Amazon come from Alibaba. The vendors who sell them may have no idea that they are fake AW batteries and could be dangerous.
I recommend buying only from trusted e-cig vendors who have a verified supply chain direct from the manufacturer. RTD Vapor, Illumination Supply, and Orbtronics for example.
Presently, the IMR with the highest mAh rating which is still high drain is the Panasonic or Orbtronic NCR18650PF 2900mAh batteries. The NCR18650A 3100mAh and NCR18650 3400mAh batteries made by Panasonic & Orbtronics are NOT high drain batteries. I know, its confusing. It takes someone who has done a lot of research into mod batteries to know which ones are which. And with new chemistry batteries coming onto the market every couple of months it becomes even more confusing.