Search found 117 matches

by fourbanger
Jan 22, 2018 1:14 am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 158
Views: 12882

Re: Spot Welding Copper Strips to 18650 Battery Cells

So, these exist: https://www.aliexpress.com/store/product/High-quality-18650-battery-holder-For-big-power-battery-pack-50A-100Ah-200Ah-Lower-price-is/623665_32837557299.html?spm=2114.12010615.0.0.5da6407dNQrXvq https://www.aliexpress.com/store/product/18650-battery-copper-strip-High-power-battery-co...
by fourbanger
Jan 22, 2018 1:00 am
Forum: Battery Technology
Topic: DIY spot-welder, transformers from microwave ovens?
Replies: 46
Views: 4228

Re: DIY spot-welder, transformers from microwave ovens?

I actually kinda like that design with the capacitor selector. Very resourceful use of low tech parts. A friend of mine once showed me a spot welder they'd developed at DND (about a hundred years ago) that used a rotary phone to *ahem* dial in the number of pulses needed to make the weld. Life befor...
by fourbanger
Jan 13, 2018 5:21 pm
Forum: Battery Technology
Topic: Reliable aliexpress battery pack?
Replies: 39
Views: 2153

Re: Reliable aliexpress battery pack?

Right. Gotcha.
by fourbanger
Jan 13, 2018 2:33 am
Forum: Battery Technology
Topic: Reliable aliexpress battery pack?
Replies: 39
Views: 2153

Re: Reliable aliexpress battery pack?

Hope this is not too OT but I notice on their aliexpress page that UPP packs won't ship to Canada. When I change the location to the US it says it won't ship there either. In fact, out of the handful of countries I selected, only the UK and Norway were viable options, which really doesn't help me at...
by fourbanger
Sep 02, 2017 7:54 pm
Forum: Battery Technology
Topic: 18650 Cell Source
Replies: 44
Views: 2717

Re: 18650 Cell Source

Vruzend.com was selling LG MJ1 cells for $4 a pop last I checked. I'm pretty sure they're based out of Florida and is run by one of the board members here. Check the for sale section under new. Member Okashira seems to be selling tesla car cells out of Texas. For sale (used) section. Of aliexpress I...
by fourbanger
Aug 24, 2017 10:42 am
Forum: E-Bike Technical
Topic: How much regen power is possible?
Replies: 6
Views: 402

Re: How much regen power is possible?

I feel like I'm missing something important here. If a li-ion battery is OK to recharge at 1C then a 4P (for example) setup of 3.5ah cells is perfectly happy to charge at 3.5*4 = 14A? Why does this seem so high? Also, I'm really intrigued by this bridge rectifier concept. Has this been tested? I'm l...
by fourbanger
Aug 08, 2017 8:05 pm
Forum: Battery Technology
Topic: 18650 Cell Source
Replies: 44
Views: 2717

Re: 18650 Cell Source

Just thought I'd drop by to say my order from nkon arrived today. Placed it on July 17 and the man at the door wanted $35 CAD and change. Box looked a little beat up but I think the foam peanuts took the brunt of it. Good thing they're hydride batteries. From my experience, I would recommend dealing...
by fourbanger
Aug 04, 2017 1:13 pm
Forum: Battery Technology
Topic: 18650 Cell Source
Replies: 44
Views: 2717

Re: 18650 Cell Source

So where's elsewhere?
by fourbanger
Aug 02, 2017 9:39 pm
Forum: Battery Technology
Topic: 18650 Cell Source
Replies: 44
Views: 2717

Re: 18650 Cell Source

Just made an order to nkon a couple weeks ago. Some spitty bits from my paypal receipt: Description Unit price Qty Amount Samsung INR18650-35E 3450mAh - 10A Item# samsung-35e 2.90 EUR 84 €243.60 EUR Subtotal €243.60 EUR Shipping and handling €30.00 EUR Total €273.60 EUR Payment €273.60 EUR Payment s...
by fourbanger
Jul 27, 2017 9:02 pm
Forum: E-Bike Technical
Topic: Custom pack 20700 cells, Need Yay/Nay regarding my ideas
Replies: 6
Views: 601

Re: Custom pack 20700 cells, Need Yay/Nay regarding my ideas

Your 4th set of sense wires? What's up with that?
by fourbanger
Jul 25, 2017 9:13 pm
Forum: Items for Sale - Used
Topic: SOLD
Replies: 16
Views: 1330

Re: BHT 48V 1000W Brushless motor kit(US)

For god's sake, someone buy this!
by fourbanger
Jul 21, 2017 3:17 pm
Forum: Items for Sale - New
Topic: NEW model Eaton APR48-ES 2000w high efficiency 96% for sale
Replies: 14
Views: 1040

Re: NEW model Eaton APR48-ES 2000w high efficiency 96% for s

How high can the voltage be set and how low can the current?

Thanks.
by fourbanger
Jul 20, 2017 12:44 am
Forum: Battery Technology
Topic: Do any BMS's balance at 4.1V instead of 4.2V?
Replies: 46
Views: 2922

Re: Do any BMS's balance at 4.1V instead of 4.2V?

As was implied (I believe) in one of SMs articles, there really isn't much incentive for battery manufacturers to advertise the fact that NOT fully charging a given cell could significantly increase its lifetime. IF, however, a car company offers an 8 year warranty on their vehicle's battery pack, y...
by fourbanger
Jul 19, 2017 3:35 pm
Forum: Battery Technology
Topic: What kind of charger?
Replies: 28
Views: 1028

Re: What kind of charger?

Hmm, that's curious. I'd hate to put myself in the unenviable position of buying one and not being happy because it doesn't perform better than its officially rated.

Thanks for the info, though. 'Preciate it.
by fourbanger
Jul 18, 2017 7:10 pm
Forum: Battery Technology
Topic: What kind of charger?
Replies: 28
Views: 1028

Re: What kind of charger?

That's an attractive price, too. They even have 400W one for el-cheapo. Are these safe to use as chargers? Hey Amberwolf, I'm looking at the datasheet for the HLG-600 and it's telling me that the 54A version can be adjusted from 45.9-56.7 but if you're charging a 14s pack you'd need more like 58, so...
by fourbanger
Jul 17, 2017 9:35 am
Forum: Battery Technology
Topic: What kind of charger?
Replies: 28
Views: 1028

Re: What kind of charger?

It would be nice if there were a simple BMS out there that would allow for cell balancing at say 4.1 or 4.15 to extend battery life. @Cal the CLG series do indeed seem to allow for more leeway in adjusting voltage output. Still, it'd be really spiffy to have a charger that would allow for a +/- 1S p...
by fourbanger
Jun 25, 2017 1:21 am
Forum: Battery Technology
Topic: what do you think of these ebay cells (with BMS)
Replies: 4
Views: 307

Re: what do you think of these ebay cells (with BMS)

What's that work out to, 13 cents a watthour? Seems to me anything under 30 and you're doing pretty well.

What are you going to do with 1000 18650 cells though?
by fourbanger
Jun 24, 2017 7:19 pm
Forum: Items for Sale - Used
Topic: (Sold) 600Wh Battery Pack with PCM
Replies: 6
Views: 621

Re: 600Wh Battery Pack with PCM

You should come over to Victoria soon. That's what I'd do if I were you.
by fourbanger
Jun 11, 2017 3:23 pm
Forum: Battery Technology
Topic: Charger voltage issue
Replies: 5
Views: 219

Re: Charger voltage issue

Maybe wire something like this little cheapo up to your charger and tape/glue/velcro it on somewheres. It won't be deadly accurate but it should be enough to tell you if something goes dramatically wrong again in the future. http://www.ebay.com/itm/2pcs-Mini-DC-0-100V-Red-LED-3-Digital-Display-Volta...
by fourbanger
Jun 01, 2017 11:36 pm
Forum: Battery Technology
Topic: Battery charger mod.
Replies: 7
Views: 460

Re: Battery charger mod.

Geez, I totally forgot about this thread. Sorry guys. Well the other week I tried wiring in a variable resistor in parallel to that big resistor dead center in the picture. Bad things happened. See that little black cap on the lower right side? Yea, that isn't around anymore.. big noise for such a t...
by fourbanger
Jun 01, 2017 10:36 pm
Forum: E-Bike Reviews & Testing
Topic: Bafang BBS01 350w vs Dillenger 250w front hub
Replies: 195
Views: 37389

Re: Bafang BBS01 350w vs Dillenger 250w front hub

Thanks for the prompt reply. I keep eyeing that seller on ali but have been too chicken to go through with it. Some vendors set off my BS detector more than others and these guys always seem right on the fence to me. 15A discharge on that battery seems a little anemic to me but hey, if that's all yo...