How large is the battery unit at the hub?
1734931
there are three places to put double A batteries on the device and they blend in so its hard to see them
1734932
the battery unit(s) look like a doughnut segmented out into three pieces. Each piece holds an AA battery. Each segment connects via "ball and socket" style ends. When the segments are joined encapsulating the wheel hub, it appears very uniform and is quite sturdy. I suggest that you use small zip ties to affix things in their proper place. Good luck, they are quite bright and make for great visual locators for position and speed. Lights not moving, stationary position. The faster the lights move, the faster I know the bike is moving.
499701
The internal battery died years ago. Have been using a mini USB phone charger since. Have also powered the device through usb hub. The device lays on my truck dashboard. Device is about 2.5" x 1.5" x .75" going from memory, as I am not at work today. Could be more precise later.
284683
3 by 2 inches (just enough for three AA batteries). Also, the battery compartment is attached to small cord, it's not directly on the bottom of the branch.
473962
The dimension are 7.1 x 3 x 6.6 inches ; 25.3 pounds. I used the batteries in my Pride GoGo Elite Traveller plus scooter. They fit fine in there.
1928080
Not sure of the dimensions but I can tell you that it is the standard usb hub sizes found on pc's & laptops
1969149
Not counting the cord plugs (which will stick out the back [and front if you use the USB hub) it is about 4" deep by 4.5" wide by 3.75" high (7" high with a 3.5" drive in the bay).
2066305
The unit is about 6-8 inches long and a couple of inches around. I usually hold it in 2 fingers with no problem. It easily fits in my travel bag for toiletries. The picture on the box makes it appear to be bigger than it is. It works great.
1066053
The hub is about 4" long. The wheel additionally comes with plastic spacers in case those are needed with your wheel barrow.
177045
I measured the center hub with a ruler with centimeters on it, since they were coming from abroad. I also measured it in inches and compared it with the description on the hub caps.
2019512
Product Dimensions: 10.8 x 7.2 x 2.5 inches ; 12.1 pounds. ac cord about 2 ft the battery wires are about 3ft long
2224475
I'm guessing but it was roughly 8-10in x 4in x 3in (LxWxH). It was an /okay/ buy. The first day I got it it took forever to find out how to get the battery in. It was a pretty simple thing really, unscrew and lift up the panel. But I ended up messing it up and now my car steers to the side a little bit.
971879
5 7/8 inches long x 3 3/4 tall x 2 3/4 wide . WHEN I GOT THE BATTERY , I WENT W T F ! BUT IT REALLY DOES THE JOB , I'VE HAD NO PROBLEMS WITH IT AT ALL AND I AM A AVID FISHERMAN . Even ran my electric motor once in an emergency !!
487491
It's a round quarter in size,CR 2025 Lithium battery 3volt, but I haven't had to change mine yet.
2268226
The hub is about 3 11/16 inches long about 1 inch wide and its height or depth tapers from about 5/8 inch to about 1/2 inch. very small and lightweight as others have noted.
983803
Didn't measure it but have had a few electricians tell me you could hook a million of these things up to a car and it will barely use your battery. I know I have mine on all the time and haven't killed the battery yet!
189289
The power supply plugs into any standard electrical outlet (110-115 V). I have not tried using the hub as a bus-powered device.
1974477
I did not measure the size of the 2 batteries, but I do have the APC Back-UPS XS 1500 tower.... if that helps, and the 2 batteries matched what was in that UPS. I actually remember 4 wires connected, 2 on top and when the other was separated of each other, there were 2 more wires.