Lipo packs are generally listed as 300 cycles. Using every day and charging every day should give a year or so. More likely some other part will fail first.
Thank you so much for answering my question. With the Cyber Monday sale I can score one for about $37, which seems like a great deal. I may just take the punge and buy it. I'm not a heavy vaper any more. It's mostly in the evenings when I'm relaxing, or when I'm in the car. devices are so funny. I still have the Silver Bullet I bought four years ago. It works pretty darn well. My dad had one and he was having to send it back to AltSmoke about once every couple of months to have the firing connections repaired. And I had a eGo battery that lasted a couple of months, and I have one that's three years old and still going strong.
