I have a KR808d-1 style e-nic I use for backup. I have 3 of those batteries and 2 PCC's for them. Nice small battery but it doesn't take much time to deplete the battery. I use if for short trips out of the house or when I am doing a lot of physical activity in case it falls out of my pocket like when I'm roughousing with my young sons so I don't lose my favorite tornado tank. I can get a tornado tank battery to last me from waking till I go to sleep. The one reason I keep them around is these particular batteries have a full LIFETIME garantee. If a battery dies I just call the company, get an RMA number and then post it back to them and a free replacement is on it's way. I've had battery issues with then before and they sent me replacements and a SASE bubble mailer for my dead battery before I even shipped out the dead battery. It's a decent company BUT they ONLY sell the KR808D-1 style e-nic, no bottled juice , thread adapters, etc. I don't buy their products anymore but keep them around and refill the cartomizers with TW e-liquid. My only source for my e-cig hardware and supplies is TW for the past few months and I don't see any other suppliers with the discounts and specials , like the yo-yo promo and the weekly discounted items. Add to that the new lower price structure for atomizers, batteries, etc and I don't have any reason to go elsewhere for my supplies.