Search found 24 matches

by mattthemuppet
Nov 17 2019 6:38pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 9376

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

john61ct wrote:
Nov 15 2019 5:15pm
Pretty good! Which cells comprised that pack?
The first one was definitely Sanyo/ Panasonic NCR18650GA and I'm pretty sure the second one is too, based on capacity and the assumption they'd make a bunch the same.
by mattthemuppet
Nov 15 2019 3:59pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 9376

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

yeah, dunno about all the ^, but I have a couple of useful data points on NCR16850GA cells and they're not great. I have a Giant Road E and ride about 10,000 miles a year. First battery went down to ~55% capacity after 18,000 miles and ~450 charge/ discharge cycles. Second battery, bought at the beg...
by mattthemuppet
Oct 26 2019 5:46pm
Forum: Items for Sale - Used
Topic: New but previously assembled Sanyo GA $4/ cell or less USA only
Replies: 0
Views: 979

New but previously assembled Sanyo GA $4/ cell or less USA only

Hi all, I built a replacement pack for my Giant Road-E, which ended up not working due to BMS issues, so needed to buy a new battery to get back on the road. There wasn't any interest in the pack as built, so I've stripped it down (:() and am selling the cells. Cells have been charged individually o...
by mattthemuppet
Oct 19 2019 11:52am
Forum: Items for Sale - Used
Topic: 10S4P battery with new Sanyo GA cells
Replies: 2
Views: 476

Re: 10S4P battery with new Sanyo GA cells

happy to entertain offers before I put this up on eBay. Also have a 3 pin plug with a cover for a charging receptical and some XT150 plugs I'm happy to throw in to help with setting up the pack.
by mattthemuppet
Oct 16 2019 12:32pm
Forum: General Discussion
Topic: Crash Thread - lucky
Replies: 38
Views: 3609

Re: Crash Thread - lucky

Had my first crash of 2019 - I was on the sidewalk and a guy on a walker was up ahead so I go onto the road, pass him then go up the rounded curb then onto the sidewalk. The sidewalks edge had some soft mud so the front wheel railed along the edge as I fell onto my shoulder and hands softening the ...
by mattthemuppet
Oct 13 2019 10:23am
Forum: Items for Sale - Used
Topic: 10S4P battery with new Sanyo GA cells
Replies: 2
Views: 476

Re: 10S4P battery with new Sanyo GA cells

had a query about the cells used in the pack, so I took some pics of a spare cell to (try to) show the cell code which reads NCR18650GA 6205

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by mattthemuppet
Oct 08 2019 5:49pm
Forum: Items for Sale - Used
Topic: 10S4P battery with new Sanyo GA cells
Replies: 2
Views: 476

10S4P battery with new Sanyo GA cells

Full disclosure. This pack does not come with a Battery Management System as the one that it came with was bricked by me during the tear down. To be used safely it will need a 10S BMS wired in, which will cost from $10 for a basic one off eBay/ Aliexpress up to however fancy you want to be. I'll le...
by mattthemuppet
Sep 17 2019 1:34pm
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 980
Views: 128280

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

I did actually remember what happened (long time ago and terrible memory) - the nut holding the freehub on started to unscrew, which applied alot of pressure to the cones and I think those unscrewed a bit. Not a lot of help in your situation, but at least I remembered! The star nut tool is a large k...
by mattthemuppet
Sep 13 2019 10:56pm
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 980
Views: 128280

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

good, glad you got the steerer and headset sorted out. Not something you want loose. Those star nuts are a pain to get in, the bike shopes have a neat tool they use to hammer it in. Yeah, I'm as lost as you are about the cone unscrewing. No real ideas, but hopefully it won't happen again! No issue o...
by mattthemuppet
Sep 12 2019 12:55pm
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 980
Views: 128280

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

what beautiful dogs! I haven't had time to read the whole thread, but are you using a star nut in the steerer tube to preload the headset bearings? You shouldn't need to use a strap to tighten the headset, but have the head set and spacers the right stack height so tightening the top steerer bolt pr...
by mattthemuppet
Sep 04 2019 5:11pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 223
Views: 41613

Re: Spot Welding Copper Strips to 18650 Battery Cells

worked a treat for me - I used Cu sheet and cut it to cover all the cells (8) being connected, then used the Ni strip to do the serial connections. When I did some tests I had to use pliers to peal the Ni strip off the cells, so it was a solid connection. Much to my sadness I borked the BMS during t...
by mattthemuppet
Sep 04 2019 1:23pm
Forum: Battery Technology
Topic: Better/ easier to sell a battery with or without BMS?
Replies: 3
Views: 195

Re: Better/ easier to sell a battery with or without BMS?

hmm, good points thank you. After looking around at some of the ones on eBay it struck me that I don't have any way of testing any BMS I wire up as I can't discharge the battery as it's built - I don't have any suitable load that I can place on it to make sure the BMS is working. I'd rather sell it ...
by mattthemuppet
Sep 04 2019 10:30am
Forum: Battery Technology
Topic: Better/ easier to sell a battery with or without BMS?
Replies: 3
Views: 195

Better/ easier to sell a battery with or without BMS?

Hi all, figure I'd put this to the collective wisdom. I have a very nice 10S4P battery I built for my Giant eBike but in the process bricked the BMS so it won't talk to the controller. Only option was to buy a new battery (ouch) from the bike shop. I'm planning on trying to sell the rebuilt battery ...
by mattthemuppet
Aug 31 2019 12:22am
Forum: Battery Technology
Topic: Amateur's Build your own charger
Replies: 31
Views: 1004

Re: Amateur's Build your own charger

relying on a house breaker as a fuse for a charger in case of failure seems wantonly reckless. At least put a fast blow fuse in line with the supply.

The ring terminals that are zip tied together - is that to keep them out of the way? Or are those connections?
by mattthemuppet
Aug 01 2019 11:56am
Forum: E-Bike Build Threads / Photos & Video
Topic: Custom Kickbike Build (laser cut and welded frame)
Replies: 14
Views: 1047

Re: Custom Kickbike Build (laser cut and welded frame)

that is very impressive, well done! When you modelled it were you able to also model the stresses in the frame? Particularly around the junction where the down tube (?) meets the sort of horizontal bit that holds the head tube. More pictures of the battery, controller and how they fit in between the...
by mattthemuppet
Jul 21 2019 5:50pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 10 kW Giant Glory 1
Replies: 43
Views: 7606

Re: 10 kW Giant Glory 1

holy cow bells, what a build! Loved the videos too, especially the snow one. Riding on snow with standard mtb tires isn't trivial, doing so with several horsepower is even less so! How do you find the bike on jumps - is it still balanced? Does the power help you get the take off speed right? I imagi...
by mattthemuppet
Jul 03 2019 9:35am
Forum: Battery Technology
Topic: Best cheap spotwelder?
Replies: 19
Views: 1443

Re: Best cheap spotwelder?

I just bought a Malelectrics spot welder - came to $140 shipped to the US, plus $60 for a 3S 75C lipo from Hobbyking. Great instructions and super easy to put together. Only done a few tests so far, but works a treat. I went this route rather than one of the Suncko (?) ones as they have pretty mixed...
by mattthemuppet
Jul 02 2019 6:25pm
Forum: Battery Technology
Topic: Recovering a LiFePO4 cell (A123) at 0V
Replies: 4
Views: 437

Re: Recovering a LiFePO4 cell (A123) at 0V

I tried recovering some Lifepo4 cells from a Segway pack that had self-discharged to 0V with no success what so ever. Dead as a door nail. Wasn't so much interested in re-using them as I was in testing to make sure that the BMS would function with new cells.
by mattthemuppet
Jul 01 2019 9:27am
Forum: E-Bike General Discussion
Topic: Advice on ebike kit for 30 commute
Replies: 20
Views: 1177

Re: Advice on ebike kit for 30 commute

narrower tires I wasn't really paying a lot of attention, but I've been seeing some discussion lately that contradicts this. Came as a surprise, but if I remember the story right, given tire inflation that is equivalent in some reasonable way, you're going to get a contact patch of a certain size. ...
by mattthemuppet
Jun 30 2019 2:06pm
Forum: E-Bike General Discussion
Topic: Advice on ebike kit for 30 commute
Replies: 20
Views: 1177

Re: Advice on ebike kit for 30 commute

for that distance I'd suggest an electric road bike and to be honest, an off the shelf one. I ride 50 miles a day every week day every week of the year on a Giant Road-e and it works just fine. The road bike aspect is the key - a more aero position and frame, with narrower tires than you generally f...
by mattthemuppet
Jun 26 2019 2:20pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 223
Views: 41613

Re: Spot Welding Copper Strips to 18650 Battery Cells

WTF!! IT WORKS! easy as pie. It's like the copper isn't even there. The nickel punches a hole straight through and welds to the can, fasting the copper no prob. I did .1mm cu for all tests .1mm Ni on top was dead easy but a littleweak as both strips a re weak. .15mm Ni was probly the best all round...
by mattthemuppet
Jun 17 2019 6:23pm
Forum: E-Bike General Discussion
Topic: Cyclist spits at me and makes a buzzing noise !
Replies: 71
Views: 5938

Re: Cyclist spits at me and makes a buzzing noise !

there's one roadie I see occasionally on my commute who never acknowledged my wave. Stopped bothering after a couple of times. Most other cyclists are pretty friendly, though I don't see that many in San Antonio on the route I ride. Not particularly bothered if people ignore or don't like me, but I ...
by mattthemuppet
Jun 16 2019 10:23am
Forum: Items for Sale - New
Topic: CHEAP NEW ORIGINAL CELLS LI-ION 18650
Replies: 790
Views: 203042

Re: CHEAP NEW ORIGINAL CELLS LI-ION 18650

thanks Michal, funds sent!
by mattthemuppet
Jun 15 2019 2:20pm
Forum: Items for Sale - New
Topic: CHEAP NEW ORIGINAL CELLS LI-ION 18650
Replies: 790
Views: 203042

Re: CHEAP NEW ORIGINAL CELLS LI-ION 18650

Hi Michal,

not sure if my PMs are getting through. Just waiting on a Paypal address so I can get these cells ordered. Thanks!