My IPV4 runs in series. It is cheap at around $60-$70. Has 100 watts and does Temperature Control. Works fine but most people don't seem to like it that well. Kinda on the big side. I have long fingers so not a problem for me. Also the battery cover may wear in time. Mine fits and stays on fine after a couple months use. Would I buy one again - no. I'd look for something a little more well made and comfortable. Keep looking you'll find what you want. All kinds of new devices hitting the shelves almost daily.
I have a IPV3 and I use it everyday. I bought it a little over a year ago and it has never let me down. As I recall it was about $80.00. Now make the IPV3i with temp control and I think I am going buy one shortly.
You have not given us much to go on other than you want the box format . Mechanical or regulated and what is the maximum power (watts) you want to vape at?
Also, the reason you want batts in series as opposed to parallel could make a difference.
Not even sure that a stacked battery box mod is made. Any of the major manufacturer's box mods will serve you well. I personally use the IPV4 and couldnt be happier.
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