They are manufactured by Saf-t-lite corporation. Their website is www.saftlite.com/.
What you need is the Stubby II and the belt pack and charger. They actually sell this as the Snake Hunter's kit. If you want the kit, you should email or call them.
You can also do what I do. I have just the stubby II then I bought a car jumpstarter from Wal-Mart. Their website doesn't show the car jump starter, but it is basically a rechargeable 7amp hour 12 V battery in a plastic case with a cigarette lighter socket. They also come with a 110v plug in charger.
I carry mine in a small fanny pack that has a shoulder strap to help support the weight.
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Chris Harrison