Unfortunately after problems with cartridges I gave up using Intellicig about two years ago now. Since that time I have used Liberro and find that their batteries last well over a year. I am using 4 in totation, so I always have a battery fully charged ready for use. Each battery lasts for about one day and with the cartomisers lasting two days, although possible more expensive using cartomisers. I am saving a fortune using this product. Having had health problems since I stopped smoking, I xchecked with my Chest Consultant about using zero nicotine cartomisers and he told me that it was OK to use them. If you are having problems with any other company or their products, then I heartily recommend Liberro.
