Excellent batteries that are authentic (not fake like others have said). I bought four total, long with the Nitecore D3 charger. They take 4-5 hours to recharge (depending on how low they are when I got to charge them). I use them exclusively in my IPV3 LI mod and so far (purchased back in end of August) they are working great. Be sure to label and marry your batteries when using them, always use them together exclusively, and be sure ..