Search found 11133 matches

by spinningmagnets
Feb 24 2021 7:49am
Forum: Battery Technology
Topic: 40T, neodymium magnets, plasti dip cycle test
Replies: 128
Views: 7220

Re: 40T, neodymium magnets, plasti dip cycle test

Thanks, I was familiar with annealing steel, but when I read about copper annealing, they did not specify that it could be cooled rapidly.
by spinningmagnets
Feb 23 2021 12:31pm
Forum: E-Vehicles General Discussion
Topic: Can Tesla converted to diesel?
Replies: 22
Views: 513

Re: Can Tesla converted to diesel?

Series-hybrid is my favorite drivetrain for a plug-in electric EV. That being said, a pure series hybrid would be easy to figure out, and as far as retrofitting, all it takes is money...lots and lots of money. My son has a Chevy Volt, and the battery is small, maybe 80 miles? But the thing is, he dr...
by spinningmagnets
Feb 23 2021 10:35am
Forum: Battery Technology
Topic: 40T, neodymium magnets, plasti dip cycle test
Replies: 128
Views: 7220

Re: 40T, neodymium magnets, plasti dip cycle test

I'd like to make a note about this, great stuff. The positive end of 18650 and 21700 cells are very robust and can take quite a bit of abuse when considering various methods of bus connections, such as spot-welding, soldering, and others. However the negative end is sensitive to heat. Using magnets ...
by spinningmagnets
Feb 22 2021 1:14pm
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 474
Views: 79431

Re: N.E.S.E. the no solder module

For anyone who is curious about what these modules could be used for besides an ebike, there are a lot of children's toy electric cars that run off of a pair of lead-acid wheelchair batteries for 24V. A seven-cell in series pack of 18650s of the same volume of the original 2S SLA PACK would run twic...
by spinningmagnets
Feb 20 2021 7:23am
Forum: EBike Build Threads
Topic: Mongoose Blackcomb
Replies: 10
Views: 387

Re: Mongoose Blackcomb

Doctor Bass, one of his first hot rods...
by spinningmagnets
Feb 19 2021 2:57pm
Forum: Battery Technology
Topic: Battery design advice required
Replies: 19
Views: 523

Re: Battery design advice required

I'm not a fan of the X form of your series/parallel connections. That being said, the series connections are handled by the nickel strips and their welded connection to the cell ends. The parallel connections are where the two strips cross to form the center if the "X". Perhaps consider so...
by spinningmagnets
Feb 19 2021 10:19am
Forum: Battery Technology
Topic: Trying to increase my batteries longevity but did i actually destroy it doing so?
Replies: 22
Views: 543

Re: Trying to increase my batteries longevity but did i actually destroy it doing so?

Your BMS is not balancing your pack. It's only bulk charging Get a small 12V filament bulb from an auto parts store, solder wires onto it's two contact points, and attach the two wire ends (alligator clips?) To the positive and negative of the cell groups that are 4.22V. A large bulb (*headlight) wi...
by spinningmagnets
Feb 16 2021 11:07am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 790
Views: 196130

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

High current passes through the series connections, and that's where the copper needs to be. The parallel can be copper, but there is no benefit to using copper for parallel connections.

Have you tried the nickel/copper sandwich method for series? Have you tried the infinite slot method?
by spinningmagnets
Feb 13 2021 10:46am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Looking for featherweight geared hubmotors, >10kW
Replies: 15
Views: 554

Re: Looking for featherweight hubmotors, >10kW

There is a wide selection of hubmotors that would be up for any task given it. In an aero application where there is significant air-flow, i suspect a large Quan Shun /QS direct drive hubmotor (for small motorcycles) with 15ml of ferro fluid would provide the best weight-to-performance rating. The V...
by spinningmagnets
Feb 12 2021 12:02pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Chinese Retro Scooter - Running at 72v versus 60v
Replies: 31
Views: 850

Re: Chinese Retro Scooter - Running at 72v versus 60v

The LVC wont work, but 60V battery capacitors (16S x 4.2V = 68V fully charged?) Are likely 100V caps.

If it blows, get another.

Frankly I'd buy another controller and keep the 60V controller with the 60V packs. Buy a new 72V pack.
by spinningmagnets
Feb 12 2021 3:08am
Forum: General Discussion
Topic: New 80 volt push mowers
Replies: 115
Views: 23811

Re: New 80 volt push mowers

How old is the battery? maybe it cant pull the amps it used to when it was newer...
by spinningmagnets
Feb 12 2021 1:04am
Forum: EBike General Discussion
Topic: Seeking advice for commuter e-bike setup
Replies: 21
Views: 535

Re: Seeking advice for commuter e-bike setup

An 800 ft rise on the commute suggests to me your best choice is a BBSHD. I have ridden many dozens of ebikes, and I have owned several. The one I have kept riding for five years is the BBSHD. You could save a few dollars and a few ounces by getting the BBS02, or possibly the even smaller TSDZ2. BUT...
by spinningmagnets
Feb 11 2021 6:50pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 790
Views: 196130

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

If the negative tabs on the inside have not come loose, you'll be fine. You can individually cycle test them, and put them under load while looking at them with a cheap heat camera, to see if there's a hot spot.
by spinningmagnets
Feb 11 2021 12:08pm
Forum: Help wanted & offered
Topic: Searching for my personal battery apprentice
Replies: 22
Views: 800

Re: Searching for my personal battery apprentice

Luke, the Zero motorcycle battery that your team designed remains to this day a respected standard that other companies would do well to embrace...if I were single, I would jump at the chance.
by spinningmagnets
Feb 10 2021 10:30am
Forum: Motor Technology
Topic: Purchase advice please - Bafang Ultra M620 vs BBSHD
Replies: 4
Views: 233

Re: Purchase advice please - Bafang Ultra M620 vs BBSHD

Here is a build where the ebiker wanted to cut his frame and weld-in a proprietary build. This will give you an idea of what that would entail...(The steel in this alignment jig is easily removable after welding) https://www.electricbike.com/adding-bafang-ultra-frame/ https://www.electricbike.com/wp...
by spinningmagnets
Feb 09 2021 5:21pm
Forum: Electric Watercraft
Topic: Getting Into Electric Power Catamarans
Replies: 52
Views: 1114

Re: Getting Into Electric Power Catamarans

Thrust block,

even if the RPM's are acceptable for direct drive, maybe plan on a belt drive to a shaft on the side, with a thrust block on the end of the separate shaft?....
by spinningmagnets
Feb 09 2021 3:38pm
Forum: Electric Watercraft
Topic: Getting Into Electric Power Catamarans
Replies: 52
Views: 1114

Re: Getting Into Electric Power Catamarans

I'd look into a wrecked Zero motorcycle. I'm sure the motor controller, battery, and throttle would work very well for a boat. If it turned out to be too small, youd likely have no trouble selling it, and if it's too big, it's a good experience. Plus again...once you build the ideal system, you can ...
by spinningmagnets
Feb 09 2021 12:11pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 790
Views: 196130

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

On the negative end, avoid welding to the very center.

On the positive end, the entire surface is very isolated from the interior and you can weld to any part.
by spinningmagnets
Feb 09 2021 9:08am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77733

Re: Spot Welding Copper Strips to 18650 Battery Cells

Yeah, it's the plasma. I can't see any way to make a focused plasma jet for a few precisely timed milliseconds for under a few thousand dollars...yet.
by spinningmagnets
Feb 08 2021 8:34am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77733

Re: Spot Welding Copper Strips to 18650 Battery Cells

If its an LLC, the person cannot be personally sued for the liabilities of the company, but the battery building company can have its assets seized to satisfy the judgement against a lawsuit that was successful (or a spurious lawsuit brought by competition in order to get paid $15,000 to drop the su...
by spinningmagnets
Feb 07 2021 4:45pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77733

Re: Spot Welding Copper Strips to 18650 Battery Cells

Concerning laws, I would suggest forming any such business in the US as a welder-rental service, and the rental company rents the machines to the battery building company. You don't have to be "at fault" for someone to sue you, and there are cases where liability insurance paid $15,000 for...
by spinningmagnets
Feb 07 2021 9:50am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77733

Re: Spot Welding Copper Strips to 18650 Battery Cells

Definitely plan to “go commercial” with battery packs for go carts, E bikes, and electric motorcycles at some point in the future
Boats, forklifts, home power back-ups...
by spinningmagnets
Feb 02 2021 12:24pm
Forum: EBike Technical
Topic: will 10ah work with 1500w?
Replies: 9
Views: 582

Re: will 10ah work with 1500w?

You will be asking the battery packs to supply occasional peaks of 30A, that is the important number. If the pack gets hot, or the output has significant voltage sag, then the battery should not be used in that application. If they are authentic Panasonic cells, that's good, but all the major 5 cell...
by spinningmagnets
Feb 02 2021 11:11am
Forum: Items for Sale - New
Topic: kWeld from Keenlab now available in the US
Replies: 30
Views: 10419

Re: kWeld from Keenlab now available in the US

Contact Keith at his Facebook page. Ask him. He might be able to ship one and cancel the order from Germany.