I'm pretty much a chain vaper. I got the 900 first then the 1300 and the 900 was the first to die followed by the 1300 3 to 4 weeks later. I love this Zeus so if it's 4 batteries a year that's what it is. I'm not gonna be that concerned by it. For now I'm good with my new 900 and I got my Ego's back out the other day. New 1300 should be here tomorrow and if I need to I still have a few brand new pass-thru's and a couple boxes of the old small prefilled carto's so I'm good.