Search found 143 matches

by silentflight
Nov 05 2019 7:14am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 3421

Re: Max safe Voltage Difference when connecting two Batteries in parallel

If you have a cycle satiator or other meter to show you what's happening during charging you can get some basic info on your pack's tolerance for voltage differences. My 12S6p Panasonic PF pack, when about half empty, requires a delta of 0.6 volts to raise the charge current to 8.0 amps, which is C/...
by silentflight
Oct 30 2019 2:11pm
Forum: Battery Technology
Topic: Gear for logging C-rate vs Temperature, also capacity
Replies: 13
Views: 1815

Re: Gear for logging C-rate vs Temperature, also capacity

I use a West Mountain Radio CBA IV. It is well known, but I'll add a mention here. The standard version (which I have) only uses the thermistor to shut off charging if the cell or pack temperature goes over a preset limit. It is possible to buy a pro version which upgrades the unit to record the tem...
by silentflight
Oct 24 2019 1:56am
Forum: Battery Technology
Topic: Nkon not shipping outside EU?
Replies: 8
Views: 987

Re: Nkon not shipping outside EU?

It would be nice if batteries were stocked in local warehouses for sale and ground shipping at reasonable prices by, for example, Hobby King. At the moment it seems that buying batteries from an at least "fairly reliable" source costs the home builder about the same as buying a completed pack contai...
by silentflight
Oct 17 2019 9:17pm
Forum: E-Bike Technical
Topic: what type of connector is this?
Replies: 5
Views: 523

Re: what type of connector is this?

Thank you, Toorbough, much appreciated. Yes, the new connector has smaller diameter "gold plated" pins and the shroud on the left seems to make a water-resistant seal when fully seated. I have google-imaged solar connectors and haven't seen this exact connector yet. WIth their former penchant for pr...
by silentflight
Oct 17 2019 12:18pm
Forum: E-Bike Technical
Topic: what type of connector is this?
Replies: 5
Views: 523

Re: what type of connector is this?

Thanks, BionicBlitz, that's a good avenue to explore.

On the bx-legacy.com website this is referred to as a Vpower connector, but that term didn't bring up anything similar for me.
by silentflight
Oct 16 2019 8:56pm
Forum: E-Bike Technical
Topic: what type of connector is this?
Replies: 5
Views: 523

what type of connector is this?

this connector is used on newer BionX motors, from perhaps 2015 or 2016 until they went out of business

did BionX actually design their own connector? I have not been able to find it online
BionX New Gold Connector.jpg
BionX New Gold Connector.jpg (15.28 KiB) Viewed 495 times
by silentflight
Oct 16 2019 8:48pm
Forum: E-Bike Technical
Topic: Help ID compounds on Strain Gauge in hub motor? - photo
Replies: 9
Views: 600

Re: Help ID compounds on Strain Gauge in hub motor? - photo

I've seen the tacky white mystery compound in blood pressure transducers. I think it is there to prevent forces from being transmitted to the strain gauge from the overlying glue. Something like silly putty would probably work like that. Thank you, fechter. I also believe the purpose of the white c...
by silentflight
Oct 10 2019 3:25am
Forum: General Discussion
Topic: 10 years here!
Replies: 15
Views: 1671

Re: 10 years here!

was Safe also Randy? I forget.

...and where the heck did Xyster go?
by silentflight
Oct 08 2019 10:41pm
Forum: E-Bike Technical
Topic: Help ID compounds on Strain Gauge in hub motor? - photo
Replies: 9
Views: 600

Re: Help ID compounds on Strain Gauge in hub motor? - photo

Thanks, Punx0r. It still has me baffled, the clear outer layer is silicone RTV (at least I am fairly certain it is) but the underlying tacky putty is new to me. I'm considering using a dielectric grease in it's place.
by silentflight
Oct 05 2019 6:56pm
Forum: E-Bike Technical
Topic: Help ID compounds on Strain Gauge in hub motor? - photo
Replies: 9
Views: 600

Help ID compounds on Strain Gauge in hub motor? - photo

Thanks for reading. Any suggestions are appreciated. Sorry the text is a little hard to read. annotated strain gauge - small.jpg I'm replacing the strain gauge on my 8 year old rear hub bionx motor and can don't know what two of the compounds are. The strain gauge is attached to the axle beneath all...
by silentflight
Sep 03 2019 12:23am
Forum: Battery Technology
Topic: How do I identify my ebike's li-on cells?
Replies: 5
Views: 452

Re: How do I identify my ebike's li-on cells?

ClintBX wrote:
Sep 02 2019 5:27pm
I looked at the Sanyo cells but seem to have "C" instead. So, kinds confused.
That might just be the grade of the cells based on testing after they are made.
by silentflight
Sep 02 2019 1:36pm
Forum: Battery Technology
Topic: How do I identify my ebike's li-on cells?
Replies: 5
Views: 452

Re: How do I identify my ebike's li-on cells?

Did the battery have any brand or model identification?

Is there any faint lettering on the cells?

Could be Sanyo NCR 18650GA

See the photos in Tumich's first post here -

viewtopic.php?f=31&t=61608#p920078
by silentflight
Aug 22 2019 10:31pm
Forum: E-Bike Technical
Topic: Bionx 350 rear axle broke
Replies: 16
Views: 2150

Re: Bionx 350 rear axle broke

ian.mich wrote:
May 25 2013 10:41am
no EE worth his salt knows that controller and motor are better separate
That didn't age too well.
by silentflight
Aug 16 2019 1:26am
Forum: Battery Technology
Topic: Review of 18650BatteryStore
Replies: 3
Views: 718

Re: Review of 18650BatteryStore

Thanks for the review. That's alot of cells! The last time I bought NCR18650PF cells from IMR Battery they were all the same voltage (to within .01 volt) and had 2700 mAh when tested from 4.2V down to 3.0V, which I considered fine. I did notice somewhere on the cardboard boxes the cells came in that...
by silentflight
Aug 11 2019 5:36am
Forum: E-Vehicles General Discussion
Topic: Recently Gifted an old PL250 BionX system
Replies: 3
Views: 807

Re: Recently Gifted an old PL250 BionX system

You might be interested in using a homemade battery or one from a manufacturer other than BionX. This thread has a bit of info about how I did that on an older BionX I2C kit, while others have done it similarly on Canbus BionX systems. https://endless-sphere.com/forums/viewtopic.php?f=3&t=100791 Hav...
by silentflight
Jul 22 2019 7:57am
Forum: General Discussion
Topic: Show board index instead of image with link to board index
Replies: 1
Views: 518

Re: Show board index instead of image with link to board index

Seems like a good idea to me, are there other reasons why this isn't the case now?
by silentflight
Jun 17 2019 4:47pm
Forum: E-Bike General Discussion
Topic: What to do with my BionX-equipped bike?
Replies: 7
Views: 1003

Re: What to do with my BionX-equipped bike?

A bit more complicated and you loose regen... https://endless-sphere.com/forums/viewtopic.php?f=3&t=93078&start=100#p1372652 Thanks, Cephalotus. So the only change is adding a single resistor and supplying 12V to the motor instead of pack V as I mentioned. A small price to pay to free all of the ca...
by silentflight
Jun 15 2019 7:22pm
Forum: E-Bike General Discussion
Topic: What to do with my BionX-equipped bike?
Replies: 7
Views: 1003

Re: What to do with my BionX-equipped bike?

Hi BigWheel, I'm the guy. OP's Bionx has a G2 console which I believe makes it a canbus system. The cable mod works on I2C Bionx systems (they were replaced by canbus around 2009) by breaking out the red pos and black neg from the comm cable and supplying 5V to the console and pack voltage to the mo...
by silentflight
Jun 09 2019 6:03pm
Forum: E-Bike Technical
Topic: Longtail cargo bike project
Replies: 32
Views: 5032

Re: Longtail cargo bike project

Congrats! I've enjoyed all of your various contributions here over the years!
by silentflight
May 30 2019 1:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dewalt powered mid drive road bike
Replies: 6
Views: 1237

Re: Dewalt powered mid drive road bike

Your bike looks good with the Dewalt packs on it - utilitarian. Thanks for sharing it.

What material did you use for the 3D printed portion of the battery mount? It needs to be strong enough to withstand all the road chatter and potholes. Maybe it was a type of nylon?
by silentflight
May 28 2019 4:01pm
Forum: Battery Technology
Topic: mega copper battery spotwelder
Replies: 21
Views: 1840

Re: mega copper battery spotwelder

Just when you wonder if the Sphere is starting to go soft, somebody picks up the reins and goes wholly and appropriately overboard.

Good luck !
by silentflight
May 25 2019 6:10am
Forum: Battery Technology
Topic: Panny or Sanyo?
Replies: 44
Views: 2288

Re: Panny or Sanyo?

Not to pile on here, but I built my last pack with Panasonic 18650 PFs 12S6P and find them to be a good balance of capacity, durability and cost. I bought them from IMR Batteries and they were graded as C cells, so that is one reason they weren't too expensive. I tested them and get 2700 mAh per cel...
by silentflight
Oct 12 2018 5:37am
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 195
Views: 40423

Re: The end of BionX?

Some of the BIonx leftover cables, batteries, motors, etc... were bought by a former electrical engineer at the company. His website offers to sell the remaining inventory he has at hand.

https://www.bx-legacy.com/pages/about-us
by silentflight
Oct 12 2018 5:10am
Forum: Battery Technology
Topic: can't find pot in charger from EM3EV - photos
Replies: 5
Views: 652

Re: can't find pot in charger from EM3EV - photos

Thank you, Fechter and e-beach. I tested each of the 7 resistors I could see on the charger's circuit board by placing a second resistor in parallel while monitoring the voltage of the charger output with my multimeter. The voltage never changed. Perhaps my test was flawed? This story has a really g...