Mind telling me the model number on this hub? I have a powered usb hub, but it won't charge the passthrough. It's an oldie, though.
It doesn't seem to have a model number (unless the number is buried in the so-small-I-can't-read-it print on the back side of the unit. On the outer package, the name is shown as "USB Plus Hub" (4 port). When I went to one of the electronics superstore sites and searched for the phrase
USB Plus Hub, I found it right away.
It's about 2 inches wide and 4.25" long. When it's lying flat, it has two USB ports on the top deck, two on the side, plus one of those smaller USB sockets (I never know which size is designated "A" "B" etc.). So, it's 4 output ports plus one input port, and since I got impatient to use it and didn't read the tiny user manual, I don't know which is input and which is output.

At the very least I know that the top-deck ports are for output, cuz for testing it I have one 801 passthrough and one 510 passthrough connected there. And both work.
Where I see a major problem with the 510 passthrough is how thin the wires are that go from the battery box to the plug. Looks like a design flaw to me -- compare those wires with the ones attached to your typical compactflash card reader, or external USB hard drive. Night-and-day difference. And, the battery box is located too doggoned close to the plug.
When I plugged the thing into the computer (before getting the hub), I saw the battery box hanging down at a steep angle, bending the wires at the plug end quite a bit. Not good; I think that'd eventually cause the wires to break at the point where they enter the plug. I plugged the passthrough into one of the
side ports of the hub -- not a top port. Now the wire now comes straight out of the hub and not at an angle. It'd be great if some day, someone designed a more robust 510 passthrough. Glad I ordered two of 'em, because I think those little wires are going to give me grief sooner than later.
Can't explain it, but: with both the 801 and 510 passthroughs I seem to get better vapor even compared with using a freshly-charged battery. And -- I
really can't explain this -- when I use the passthroughs, the juice in the carts seems to hang in there longer without needing topping-off, especially so for the 801 passthrough. How the heck could that be, if ignition using a passthrough is
more efficient? If anything I'd think the juice would get used up
faster.