my 2 chargers will work on a car battery they are 12v and i use a computer power supply to power them and if the power does go out my mod will last 2 days with vaping every 5-10 min. i only have 1 carto and 1 atty right now but have more cartos on order by the end of this week i will have 4 more cartos and another 15 ml of different juices. i do have 8 different batteries but to change them out at the moment is hard because it is hard wired because of the first design. i do like my first try at a mod and have many more to come. now for juice right now i have 50ml used about 3ml right now so 47ml for the next week will be no problems. i know that all i had was just a start and will build up on what i have. i am on a limed bugget and can only spend between 10-20 a week and my brother got me what i needed to start. so by the end of next month i hope to have 10 cartos and 3 atty's and a way to clean the cartos. i will most likely do this to clean my cartos Clean your cartomizers fast and easy - YouTube . so over all i think i am set good