Hi whatagem if your a chainvaper it sounds like you need to move up to the next level and get yourself a big battery device, the one i would recomend is the Screwdriver, i have 2 and have been using them since Febuary and have not touched an analog since the main thing about the SD is it is a long term cost effective
vaping solution with performance to boot, initial purchase is expensive around $160 but long term running costs work out a hell of a lot cheaper than running your 901
1.
batteries can last 5-12hrs dependant on your usage i personally get a full days use from one battery, the batteries on average last 2-3 months and cost $6.99 for 4 to replace from dealextreme
http://www.dealextreme.com/details.dx/sku.13927#forum, the batteries output 3.6v which helps the atomiser perform to its best.
2. Atomizers should be treated as disposables, average lifespan for a heavy vaper is 2-4 weeks when performance starts becoming dull throw it away and replace, some people think atomizers can last forever they boil them wash them in coke or other substances, whats the point when you can replace them for $6-7 apiece, they are not manufactured for longterm use, the SD uses the 901 atomizer, the RN4075 is the best performer especially for throat hit as it runs hotter than the DSE 901 which runs cooler and can be better for flavor but is more prone to flooding, it is best to buy your atomizers in bulk 5+ at a time, Ruyandirect charge $6 each + $3 shipping if dont mind waiting 3-4 weeks or you can pay around $15 for shipping within a week or you can buy from Totally wicked USA for $34 for 5.
3. carts again you can get from Ruyandirect for $21 for 50, with the SD i tend to use 1 cart for 2-3 days topping off before replacing.
At the end of the day i can only recommend the SD as i have used it as my primary device for the last 4 months and am more than happy with it, IMHO it is the best looking and performing e cig out there with excellent customer service from Trog, heres a link to the SD website
ecigscrewdriver.com check it out and see what you think, there are other big battery PV's out there now such as the Prodigy the Jantystick and the GG, but the SD has the longest Track record and is the best perfoming PV in my opinium, good luck in your search.