Search found 218 matches

by Honk
Feb 02 2020 4:46am
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 46
Views: 2057

Re: Magnets to hold bus onto cell, no-weld no-solder

found these magnets but 5lb pull, the other one in previous post is only 1.5lb? pull. ill order some to see how they work Don't fool yourself. The stated pull requires a certain thickness of opposite iron to meet specifications. There is free magnetic pull calculators online where you can enter the...
by Honk
Feb 01 2020 11:48pm
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 46
Views: 2057

Re: Magnets to hold bus onto cell, no-weld no-solder

found these magnets but 5lb pull, the other one in previous post is only 1.5lb? pull. ill order some to see how they work Don't fool yourself. The stated pull requires a certain thickness of opposite iron to meet specifications. There is free magnetic pull calculators online where you can enter the...
by Honk
Jan 22 2020 3:33pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 337
Views: 30079

Re: Li-ion cells cycle ageing

It seemed to take longer bulk charging my 10S5P 30Q battery (with 2.5A charger) from 4.00V to a 4.10V than say from 3.40V to 3.50V? That's because the charge current at 3.5V is maximum, e'g 2.5A in your case. Above 4V the charge current is just a fraction of 2.5A as this is close to finished. If on...
by Honk
Jan 16 2020 2:19pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1642
Views: 224792

Re: Thread for new battery breakthrough PR releases

Loosing 25% capacity after 200 cycles is not impressive, rather lousy actually.
But they don't seem to care about that small "issue".
Easily fixed they might think, but probably not and the waiting for truly good LiS batteries continues....
by Honk
Jan 10 2020 7:17pm
Forum: Battery Technology
Topic: Surplus LiFePO4 packs 4KWH 24V 220AH.
Replies: 10
Views: 948

Re: Surplus LiFePO4 packs 4KWH 24V 220AH.

LiFePO4 has no real advantage over e'g NCM cells.
Neither at weight, capacity or price.
LiFePO4 had its glory days but we are far past that time now and looking forward to even better chemistries.
by Honk
Jan 07 2020 5:15pm
Forum: Battery Technology
Topic: Best 18650 cell for 3p 18A max
Replies: 24
Views: 932

Re: Best 18650 cell for 3P 18A max

Why limit yourself to 3P unless the space available is really tight.
More cells in parallel increases cell life dramatically.
(typo corrected)
by Honk
Jan 06 2020 3:24pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 337
Views: 30079

Re: Li-ion cells cycle ageing

Pajda wrote:
Jan 06 2020 2:42pm
In short: docware`s data are correct.
Hi Pajda and thank's for the clarification.
I suspected this was the case but it's better to ask than being uncertain.

So far LG M36 looks like the new killer cell stealing the crown in terms of cycle ageing properties.
by Honk
Jan 06 2020 12:34pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 337
Views: 30079

Re: Li-ion cells cycle ageing

Christmas package special delivery :) . PF and GA 600 cycles, M36 550 cycles, 29E7 480 cycles, 30Q 189 cycles, MJ1 150 cycles. Comparative charts on capacity and DCIR added. Hi Great charts and testing but something strikes me as odd. When charged to 4.1V the cells should be approx 90% full, meanin...
by Honk
Dec 01 2019 11:17am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1642
Views: 224792

Re: Thread for new battery breakthrough PR releases

Ok, I change my statement to "Any strange technical oddities in a press release, articles with extraordinary claims or technical papers is often a fraudulent sign".
by Honk
Nov 20 2019 5:32am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1642
Views: 224792

Re: Thread for new battery breakthrough PR releases

Any technical oddity in press releases if often a sign of bullshit and wapor ware.
The press release itself is just a fraud and the intent is raising investment capital.
by Honk
Nov 19 2019 11:22am
Forum: Battery Technology
Topic: Is a 24s battery dangerous?
Replies: 24
Views: 1703

Re: Is a 24s battery dangerous?

You could build three separate batteryblocks that you connect in series to your para-flight system.
Kind of safer if properly designed.
by Honk
Nov 18 2019 1:15pm
Forum: Battery Technology
Topic: Is a 24s battery dangerous?
Replies: 24
Views: 1703

Re: Is a 24s battery dangerous?

NexusG wrote:
Nov 18 2019 6:26am
Hi,
I plan to build a 24s (88.8v nominal voltage) Li-Ion battery for an electric paramotor
Don't forget or leave out a truly good BMS or you will by 100% certainty run into troubble.
by Honk
Nov 12 2019 1:01pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13302

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

999zip999 wrote:
Nov 11 2019 5:15pm
I'm 61 and my street bike goes 47mph on flats and 36mph on most hills. 7,000 watts. Funny I don't feel old yet.
Wait until you fall, then you'll feel old !!!!

Jokes aside, I guess your are not peddling to much at these speeds.
In that case your'e having a motorbike competing with gas bikes.
by Honk
Nov 08 2019 12:57pm
Forum: Battery Technology
Topic: IMREN IMR 3200mah batteries
Replies: 7
Views: 527

Re: IMREN IMR 3200mah batteries

You'll never get 40 amps out of these whithout killing them in the process. 40 amps is just marketing numbers. See these IMREN IMR 3200mah test numbers up to 40 amps where the cell is almost dead. image.png https://www.e-cigarette-forum.com/threads/imren-green-40a-3200mah-18650-bench-retest-results-...
by Honk
Sep 10 2019 9:49am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1642
Views: 224792

Re: Thread for new battery breakthrough PR releases

That seems like the same story repeated over and over. Golden super batteries that actually never reaches the market, nor the regular shelf for easy access. If this was really to suceed we will never be able to buy anyway as they will become reserverd for high end customers and regular Joes doesn't ...
by Honk
Apr 07 2019 1:18pm
Forum: Electric Watercraft
Topic: outboard engine conversion to electric
Replies: 5
Views: 1692

Re: outboard engine conversion to electric

Please upload or redirect to youtube.
by Honk
Mar 11 2019 6:17pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3561

Re: DIY HI POWERED PACK: First time, General questions

If a high drain cell is an absolute must there is 25S.
It handles 30A nicely besides some heating up.

https://lygte-info.dk/review/batteries2 ... %20UK.html
by Honk
Mar 11 2019 4:15pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3561

Re: DIY HI POWERED PACK: First time, General questions

29E is really what should be looked at. Build enough big pack to keep it within the suggested limits and it will last for very very long time at many cycles. https://endless-sphere.com/forums/viewtopic.php?f=14&t=96079&p=1450089#p1450053 https://endless-sphere.com/forums/viewtopic.php?f=14&t=96079&s...
by Honk
Mar 11 2019 3:27pm
Forum: Battery Technology
Topic: AliExpress battery pack unboxing (for my eZuma project)
Replies: 238
Views: 19828

Re: AliExpress battery pack unboxing

MJSfoto1956 wrote:
Feb 15 2019 4:05pm
The pack is made up of 340 cells, LG F1L 18650 3350mAh.
Here's the test review of the F1L cells in your pack.
https://lygte-info.dk/review/batteries2 ... %20UK.html
by Honk
Mar 11 2019 3:05pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3561

Re: DIY HI POWERED PACK: First time, General questions

Samsung 29E without any doubts.
Best bang for the buck and proven sturdy and longlife when cycled between 4.1V to 3V.
Keep away from prolonged hot storage.
Keep charge current at 0.5C max and discharge at 1C max and the cells might outlive your bike, boat or where ever they will be used.
by Honk
Mar 11 2019 1:15pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3561

Re: DIY HI POWERED PACK: First time, General questions

Just so you know it. 30Q is a bad cell with terrible aging properties. It does have nice low esr but its quickly killed, no matter how gentle you threat it. https://endless-sphere.com/forums/viewtopic.php?f=14&t=97844&p=1435146#p1433642 Neither can Sanyo GA be recommended for high drain packs as it ...
by Honk
Mar 10 2019 6:05pm
Forum: Battery Technology
Topic: Searching low € / kWh battery chemistry
Replies: 14
Views: 1248

Re: Searching low € / kWh battery chemistry

The fridge is needed from mid spring to late autom due to the temperature swings you mentioned.
At vinter there is no need for extra cooling.

And yes, the packs are all used at the same time in parallel as one big 12S32P battery bank.
That's why each cell only sees 0.54C discharge at max load.
by Honk
Mar 10 2019 3:18pm
Forum: Battery Technology
Topic: Searching low € / kWh battery chemistry
Replies: 14
Views: 1248

Re: Searching low € / kWh battery chemistry

The 2.9Ah range (samsung and pannies) are indestructable by comparison and if you dial the top voltage back down to 4.05v and keep the charge currents as low as you can, they will last longer then any product you use them in. Looks like I will have my four 12S8P 1kWh 29E packs to old retirement day...
by Honk
Mar 08 2019 11:52am
Forum: Battery Technology
Topic: LiFePO4 in 18650 format?
Replies: 78
Views: 5089

Re: LiFePO4 in 18650 format?

I support Flippy 100% in this.
There is no need for ultra high precision in these tests.
What matters is consistency to see the degradation over time.