Backup Battery
-
To upload a photo, upload it to a pic hosting site like photobucket or imgur or imageshack.us and then get the link but use the html code [img]url for pic here[/*img] just dont use the * and that should work
Also if the battery isnt as advertised then this like Greck said is gonna be a huge huge deal.
-
I decided to try a YouTube video. It is my first one, so don't critique me! Turn the sound up some... link text
-
@count Am i the only one to be amazed that the battery is labelled 12.8v ? can you use a volt meter and check that?
-
@Tartopom The output of a fully charged battery reads 54.4v. The only thing I can think is that there are 4 battery modules, connected in series, within the battery pack. 12.8 x 4 = 51.2 volts, which falls between the advertised 48v and what I read, 54.4v. There are certainly some unanswered questions here!
-
@Count there is something wrong... because FM claims that the battery is around 116wh and I the sticker it is 83ish...
-
@Future-Motion Can you please chime in here? Lithium Ion is very different than Lithium Iron Phosphate, and it's false advertising if the type of battery in the Onewheel isn't what you've been claiming it is.
-
Possible explanation,
usually it's 3.7V cells X 3, but they do make 4.2V Li-ion cells.4.2 X 3 = 12.6V X 4 = 50.4V , upward 54V when fully charged.
-
@thegreck - Im very curious to see what comes of this - I've been trying to understand the battery life difference between my two boards. With all other variables remaining constant (tire pressure, rider, route) I have a 10-12% delta on one board. I'm wondering if my 'shorter life' board has an imposter battery. Depending on what we learn from this discussion - I just might have to pull them apart to put eyes on...
-
@D-Wave @Future-Motion We hope to get a response quick since rumors(true or not)/reputation consequences might taint the company for a long time.
-
@DrN3RD - you're right. I certainly don't want to come across like I'm jumping to conclusions - or bashing FM, that is not my intent. I'm a huge fan and wouldn't give up my boards for anything...however - being a geeky engineering type - this has definitely piqued my curiosity...
-
@D-Wave I think I might have found a clue to the battery.
-
@DrN3RD I believe I have fount the battery manufacturer... and although at first glance it portrays itself as li-ion, further reading is indicative of a LiFePo system
http://www.a123systems.com/lithium-ion-cells-26650-cylindrical-cell.htm
-
@DrN3RD So after digging some more. I have found these patent related statements
For example, power supply xxx may include sixteen (16) A123 lithium iron phosphate batteries (e.g., size 26650). The batteries of power supply xxx may be arranged in a 16S1P
-
@D-Wave Probably the delta come from the fact that the batteries capacity can vary from 6600mah at the lower range to 6900mah for best ones, so I guess it's where the delta come from...
-
It does appear as if the term "Lithium Ion" is used to broadly describe several types of batteries, including LiFePo types, from what I read. I am in no way trying to bash or corner FM here by doing what I am doing. I am simply trying to fill a void they have left by not providing the ability to swap batteries. Yes, I realize I am on my own, and have voided my warranty by doing so, but My curiosity got the best of me. What does baffle me is that FM has chosen to NOT chime in and clear up some of these questions, as they have in many other forum posts. I do not think I have uncovered some type of cover up, and lets face it, we ALL would still be riding our OneWheels regardless of the paper specifications. However, some basic answers would be nice???
-
@Count I don't think any of us are bashing Future Motion, you've just uncovered something that appears to contradict a very important feature of the board that they advertise on their site. The company seems pretty honest, though, so I'm thinking what you're saying is probably correct, that the label on the battery packs isn't completely accurate.
But I think we'd all like to hear from the company on this issue, just to clear it up.
-
@DrN3RD nice digging - looks like a high probability match...and the specs do say LiFePo.
http://www.a123systems.com/lithium-iron-phosphate-battery.htm
-
@Tartopom - Thanks - I wasn't aware of the battery capacity range...I didn't see that in the manual - where did you find it?
-
@Count We are with you on this one my good sir.
It is not bashing we want, but questions answered. And you have fulfilled many a void. :) My hat goes off to you sir
-
@D-Wave it's not in the manual, it's in the specs of the battery pack :) each lipo are not always at their top, so they guarantee a minimal capacity and a generaly observed max one, but we are all the time in the middle.
