Before reading my review on 10 Motive vapes I use below, this advise will save you money and hassle if you don't already know that it's important to clean the rechargeable batteries and also the USB's every time before charging the battery, or at least very regularly. I've been using 10 Motive Vapes for almost 7 years but in the early days used to return some refills because didn't work or didn't work for very long and they replaced them without question. Also and although the batteries do have a limited life span and will need to be replaced, found that it was likely I'd disposed of many batteries which would still have worked for an age longer once I started to clean the ends. I do this with simply forming and forcing hard into the battery end tissue paper, others I know use fine wire wool. Try it, honest it cost nothing and possible you will have a different opinion if thinking either the refills vary in taste or length of use and/or battery life. A heavy smoker since teens, now mid 60's tried but could never give up either the addition of nicotine or habit of having what a 10 Motive Vape gives of something like a ciggie in my hand. I'm not into the flavours simply the mid strength tobacco flavour, and whilst still cost money and not likely no harm, nothing like cost of or harm done by smoking tobacco.