I'd like a small mod with a small tank recessed into the box beside the battery.
Thanks.
I just ordered an Ultimo.
I realize it's not exactly what you're looking for, but it has a built in 950mah battery which is supposed to last all day. It also uses a Vision Extreme carto, which retracts into the device and has a lid that covers it when not in use.
The retracting carto is probably the feature that really attracted me. I have been using a ProVari, with the Vision Extreme attached. While I really love using it, it IS a little long, and not very convenient to take with me everywhere.
I generally stick the ProVari in my shirt pocket, and due to the length, it sticks out of my pocket.
Also, I don't really feel comfortable putting it in my pants pocket, a) because of the size, and b) I'm just worried that it may leak. (did that come out sounding as bad as I think???)
The Ultimo's come in 650mah size and 950mah size. Only the 950mah have retracting Vision Extreme's. The smaller size comes with a cap attached to a chain.
It also has an led display, which shows you the date/time, remaining battery life, number of drags taken since last charge, and allows you to switch from 3.2v to 3.6v to 4v.
Nice little kit. They also come in (to me, rather wild) other color schemes, such as black/white zebra, pink, Leopard Fur... with a soft, rubber coating.
I'm stalking the postman right now. If anyone's interested, I'd be happy to report back after it arrives.