Search found 30 matches

by No_Shorty
Jul 06 2020 6:42am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1650
Views: 237651

Re: Thread for new battery breakthrough PR releases

The test cell had almost the capacity of an 18650 but was the size of a coin cell and can produce 20,000+ cycles. We're talking about >1000whrs/kg here which would make all the other solid state technologies being developed totally irrelevant :shock: Where did you get this info from? I can't find r...
by No_Shorty
Jul 06 2020 5:04am
Forum: Items for Sale - New
Topic: Wholesale 18650 cells (NEW) for UK/EU
Replies: 55
Views: 6089

Re: Wholesale 18650 cells (NEW) for UK/EU

as far as i know on 2.49 comes vat. Still cheaper than NKON depending on where you are buying. The UK pound is weak at the moment so the exchange rate is poor. At NKON the cells is €2.93 - in the UK this is £2.64 before VAT. VAT in the EU is also 21%, 1% higher than UK - some companies are able to ...
by No_Shorty
Jul 04 2020 2:55pm
Forum: General Discussion
Topic: Topic vanished?
Replies: 2
Views: 93

Re: Topic vanished?

Thanks for that, that was indeed the topic I was looking for - no idea why it was gone AWOL. Thanks for posting the copy here though, there is some useful stuff in there that will be good to refer back to.
by No_Shorty
Jul 04 2020 9:04am
Forum: General Discussion
Topic: Topic vanished?
Replies: 2
Views: 93

Topic vanished?

A topic I made with advice on what charger to use among other discussions about batteries has vanished - I really don't think it was breaking any rules but if so I didn't receive any kind of warning. I was just wondering if maybe it was something server-side?
by No_Shorty
Jul 02 2020 2:24am
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 14
Views: 400

Re: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

All depends on ones skillz. Indeed! If you find the appnotes and it seems straightforward to you, please make a HowTo. No it's not something I would be able to do without guidance, just seen projects around these forums that strike a layman as more complex. I did just spot the manual though, which ...
by No_Shorty
Jul 01 2020 10:52am
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 14
Views: 400

Re: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

These are components intended to be incorporated into a professionally designed product, not ready to use by consumers. If someone here has the knowledge & skills to help us be able to make use of this type of gear that would be fantastic. I'd even help pay for that info if necessary. I'm not sure ...
by No_Shorty
Jul 01 2020 4:56am
Forum: Battery Technology
Topic: 'Plug and Play' Life Cycle Testers
Replies: 9
Views: 180

Re: 'Plug and Play' Life Cycle Testers

All really interesting links - especially the open-source firmware for the '4 button' type chargers. There is no mention of being able to increase the cycles from 5 but I have dropped the creator a message with the question!
by No_Shorty
Jul 01 2020 4:18am
Forum: E-Bike Technical
Topic: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)
Replies: 14
Views: 400

Re: Lightest and most compact E-Bike charger 14s(DIY GaN charger research)

Came across these poking around the web today, reminded me of this topic - not sure if they could be configured to your specs, but they get close have ready to go PMBus and are GaN based:
https://www.digikey.com/en/product-high ... er-modules
by No_Shorty
Jun 30 2020 2:30am
Forum: Battery Technology
Topic: 'Plug and Play' Life Cycle Testers
Replies: 9
Views: 180

Re: 'Plug and Play' Life Cycle Testers

I don't know of anything outside of industrial systems used at battery manufacturers that really do what you're after. There's a couple of people doing longterm cell testing here on ES, but IIRC both have had problems with tests being interrupted (and data lost) by software bugs and power failures,...
by No_Shorty
Jun 29 2020 2:08pm
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Re: Reputable suppliers of LFP LiFePO4 pouch cells

We really are bouncing back and forth here, and a sentence like this: You pay for Wh/kg. The 160Wh/kg stuff is easy to find.. the 200-220Wh/Kg stuff is where its at nowadays. Very much suggests that LiFePO4 have matched LiPo in energy density, which as far as I am aware simply is not the case. The p...
by No_Shorty
Jun 29 2020 1:45pm
Forum: Battery Technology
Topic: 'Plug and Play' Life Cycle Testers
Replies: 9
Views: 180

Re: 'Plug and Play' Life Cycle Testers

the ebc-a20 needs a computer hooked to it for the cycle testing. im not a computer person so this might be me but if the computer goes to sleep while testing, the testing stops, so I go on youtube and find a 12hr video to play, like the sounds of waves or thunderstorms and the usb/tty cable is chea...
by No_Shorty
Jun 29 2020 3:25am
Forum: Battery Technology
Topic: 'Plug and Play' Life Cycle Testers
Replies: 9
Views: 180

'Plug and Play' Life Cycle Testers

So just wanted to check if there are many options for such a thing, I have come across the EBC-A20 and this very thorough review on BudgetLightForum: http://budgetlightforum.com/node/56801 But other than that there doesn't seem to be anything, I can see a few of the chargers/dischargers from the RC ...
by No_Shorty
Jun 29 2020 1:52am
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Re: Reputable suppliers of LFP LiFePO4 pouch cells

Are these LiFePO4 cells or NCM?
by No_Shorty
Jun 28 2020 4:41pm
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Re: Reputable suppliers of LFP LiFePO4 pouch cells

So the equivalent Winston cell from the same supplier as above - GBL Pouch vs Prismatic both 60Ah at 3.2v: 1.5kg -- 2.4kg -- so 60% heavier 288x183x18 -- 203x114x61 -- so 48% bigger $54 -- $74.59 -- so 38% pricier This is on top of the extra 30% weight the pouch cell already has over LiPo. I also ag...
by No_Shorty
Jun 28 2020 4:21pm
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Re: Reputable suppliers of LFP LiFePO4 pouch cells

A123 now Lithium Werks makes a (I think still) 20-30Ah range of pouch cell. But that does not mean the price per kWh is cheaper, they are the best for those and cylindricals. But there are plenty of top-notch sellers of LFP in prismatic hard cased cells, 20-40Ah is pretty common. Best to buy enough...
by No_Shorty
Jun 28 2020 4:17pm
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Re: Reputable suppliers of LFP LiFePO4 pouch cells

Generally speaking, I agree that when proper safety precautions are taken and the cells respected there is little chance of disaster. LiPo are by far and away the most common battery we have around us and the incidences of failures are very low. That said, I will be using these batteries at work and...
by No_Shorty
Jun 28 2020 3:20pm
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Re: Reputable suppliers of LFP LiFePO4 pouch cells

Hi thanks yea I found 'A123/LithiumWerks' batteries, but in the 26650 format they are stupidly expensive and large. The 26650 format is over double the volume of 18650 and triple the price, and LiFePO4 is way less dense than a LiPo 18650. LiFePO4 26650: So it works out to be $0.79 per Wh and 102Wh/K...
by No_Shorty
Jun 28 2020 6:49am
Forum: Vendor Relations Corner
Topic: Reputable suppliers of LFP LiFePO4 pouch cells
Replies: 20
Views: 418

Reputable suppliers of LFP LiFePO4 pouch cells

I can find plenty of suppliers aimed at the EV market for prismatic cells, I can even find suppliers of LitWerks massively expensive 26650 LiFePO4 cells. But these cells are significantly more expensive and massively more expensive than their Li-Ion 3.7v counterparts. Pouch cells on the other hand a...
by No_Shorty
Jun 24 2020 10:30am
Forum: Items for Sale - New
Topic: Wholesale 18650 cells (NEW) for UK/EU
Replies: 55
Views: 6089

Re: Wholesale 18650 cells (NEW) for UK/EU

I see, what supplier are you using that offers better prices? For the UK I had only really found them and Fogstar.
by No_Shorty
Jun 22 2020 6:01am
Forum: Items for Sale - New
Topic: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout
Replies: 52
Views: 15924

Re: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout

Can you also please confirm that the nickel here is high purity? - i.e. 99%+ purity? (from what I read here, there are a lot of sellers selling nickel with low purity that isn't good, and doesn't pass a salt corrosion test - thanks) Could you confirm the answer you received about the nickel - not s...
by No_Shorty
Jun 22 2020 5:48am
Forum: Items for Sale - New
Topic: Wholesale 18650 cells (NEW) for UK/EU
Replies: 55
Views: 6089

Re: Wholesale 18650 cells (NEW) for UK/EU

Merlin wrote:
Jun 18 2020 1:50pm
yup. i got also contact back but not sure what happens to the prices.
vape store prices unfortunately ;(
Are you looking at their wholesale site?

https://wholesale.18650.uk/cells-only/
by No_Shorty
Jun 16 2020 2:31pm
Forum: Resources & EV Related Parts and Services
Topic: Where do people get their BMS from?
Replies: 7
Views: 1232

Re: Where do people get their BMS from?

I'll be using Tiny BMS I think. I use AliExpress a lot for other things but I didn't fancy digging through the many hundreds of products and user reviews that go with them to find out which ones match the listed specs, or how much I would need to 'over-rate' the BMS to be sure everything would be OK...
by No_Shorty
Jun 16 2020 2:05pm
Forum: Resources & EV Related Parts and Services
Topic: UK & EUROPE EV PARTS SUPPLIERS
Replies: 37
Views: 48073

Re: UK & EUROPE EV PARTS SUPPLIERS

The two UK suppliers I can find for purchasing 18650 for pack builds are: https://www.fogstar-wholesale.co.uk/ and https://wholesale.18650.uk/ Both of which seem to have average prices around £2.50ex per cell - which is lower than just about any other site I have seen anywhere else in the world sell...
by No_Shorty
Jun 15 2020 10:07am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1169
Views: 161507

Re: kWeld - "Next level" DIY battery spot welder

I doubt it, Al melts at 1221C (2230F). Stainless is roughly 1440C / 2624. Once you get up to the temps to make Al plastic, the stainless is still only warm. If you get the stainless to melt, the Al will likely blow out much sooner. Most of the 18650 cells have a shell that is nickel-plated steel, s...
by No_Shorty
Jun 09 2020 1:19pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 769
Views: 178895

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

Ah is see,

I'm assuming you could just use a PCB fuse of your chosen current between the battery and bus bar?