Search found 45 matches

by Shunt
Jan 27 2020 12:47pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46594

Re: Li-ion cells cycle ageing

This is awesome work. Thank you Docware, Flippy , and Pajda for your reliable and valuable contributions . You've consistently done the electric powered community a huge service. Less educated newbies ( such as myself) - to this complicated and sometimes overwhelming niche of present and future tech...
by Shunt
Dec 29 2019 9:06pm
Forum: Battery Technology
Topic: 52 volt 24 ah battery playing possum
Replies: 9
Views: 843

Re: 52 volt 24 ah battery playing possum

These situations are why I don't use a bms. Id rather trust myself to keep tabs on it than flaky electronics.
by Shunt
Dec 28 2019 4:58pm
Forum: Battery Technology
Topic: LG HG2 Pack problems
Replies: 5
Views: 438

Re: LG HG2 Pack problems

If they didn't get hot at 16A it's highly unlikely that they're fakes. It's also unlikely that a 16A load caused premature death . But the combination of high charge rates, high discharge rates, overcharging , and shorting may have exposed some of the weaker cells. Those would have shown their head ...
by Shunt
Dec 28 2019 2:39pm
Forum: Battery Technology
Topic: LG HG2 Pack problems
Replies: 5
Views: 438

Re: LG HG2 Pack problems

There were a lot of fake HG2 for some time. Did you notice a lot of voltage sag early on when pushing high current?
by Shunt
Dec 25 2019 12:58am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46594

Re: Li-ion cells cycle ageing

I could be mistaken, but I don't think many vendors in the states had the M36 , until very recently, but I just noticed that IMR has them for $3.49USD/ea . I can't wait to see how they do at 2C . Is there any chance one of you guys could run 100 cycles at 5 or 6 amps before I get my equipment ? Just...
by Shunt
Dec 22 2019 2:55pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46594

Re: Li-ion cells cycle ageing

Freakin awesome Doc.
by Shunt
Dec 12 2019 7:16pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46594

Re: Li-ion cells cycle ageing

Once christmas is in the books , I'm going to try to get the equipment to help with this testing. Notably 2C and 3C loads on M36 , 30Q, 29E, M29, VTC6, and Sanyo UR18650NSX up to around 300 cycles.
by Shunt
Dec 12 2019 2:09am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46594

Re: Li-ion cells cycle ageing

I'm a bit stunned how bad the panny/sanyos look .
by Shunt
Dec 12 2019 2:07am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46594

Re: Li-ion cells cycle ageing

If this goes to 1k , my money is on 29E to finish with the highest capacity. His results basically reinforce everything Flippy has posted many times.
by Shunt
Oct 08 2019 6:57pm
Forum: Battery Technology
Topic: Sweet spot for cycle life?
Replies: 9
Views: 584

Re: Sweet spot for cycle life?

Probably too many variables to get that nit picky about it. Just stick to your 50% - 80% and don't charge it in freezing temps .
by Shunt
Oct 08 2019 6:42pm
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 105
Views: 8122

Re: Samsung 40T and other cells like it?

The Queen Battery QB26800 doesn't quite hit the current rating to compete with the high discharge Samsungs , but it has a whopping capacity per cell . I haven't used these personally to comment on longevity , but they apparently test well in reviews.
by Shunt
Sep 18 2019 6:29pm
Forum: Battery Technology
Topic: Battery kit - Does it need spot welding?
Replies: 5
Views: 396

Re: Battery kit - Does it need spot welding?

Even those Vruzend caps that have spring loaded contacts have to be secured with bolts basically to maintain enough pressure . Physics just isn't kind to pressure contact methods of battery building. Probably the best solution that doesn't involve welding is AmTech https://18650.lt
by Shunt
Sep 18 2019 6:23pm
Forum: Battery Technology
Topic: Battery kit - Does it need spot welding?
Replies: 5
Views: 396

Re: Battery kit - Does it need spot welding?

"3. Battery holder can be spliced by locking bar. Holder and locking bar is separate design. Then it is ok to weld small battery pack firstly, and then to assemble big battery pack. (Another factory holder only can be assembled firstly, and then to weld battery pack. It is not good for big battery p...
by Shunt
Sep 18 2019 6:12pm
Forum: Battery Technology
Topic: Battery kit - Does it need spot welding?
Replies: 5
Views: 396

Re: Battery kit - Does it need spot welding?

It does require spot welding. Those are just holders and not modules with contacts.
by Shunt
Aug 23 2019 9:48pm
Forum: Battery Technology
Topic: clamp meters
Replies: 17
Views: 882

Re: clamp meters

dustNbone wrote:
Aug 23 2019 7:44pm
I have several of these and they are disturbingly accurate.

Image
That's good to know. I'll have to try one of these.
by Shunt
Aug 20 2019 6:30pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20610

Re: Boston-Power Swing 5300 Li-ion cell test

Nice breakdown ! It looks even better than I thought it would be , for soldering purposes.
by Shunt
Aug 20 2019 1:41am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20610

Re: Boston-Power Swing 5300 Li-ion cell test

Soldering to the negative end on an 18650 is not what bothers me at all. Same for the BP cells and it has a nickel strip on it so that's not going to transfer heat anything like soldering direct to the steel can on an 18650 would. It's the positive pole. This is the top of a Samsung 18650. Heat fro...
by Shunt
Aug 19 2019 8:24pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20610

Re: Boston-Power Swing 5300 Li-ion cell test

Tabbed? Well yes...it's an aluminum shell. Getting nickel to spot weld to aluminum will be very difficult. The little bit of nickel strip on the bottom of the cell is ultrasonic welded to the aluminum shell. Most folks can't afford the $4000 for a cheap ultrasonic welder! Is that positive post "but...
by Shunt
Aug 19 2019 5:25pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20610

Re: Boston-Power Swing 5300 Li-ion cell test

Cycle life is a major factor in a true full cost comparason. A cell that has 2-3 times the cycle life , is effectively half or one third the cost ! ......unless you are using them in a “one shot” device like a missile ! :lol: I had to laugh! Yes...exactly my use case...on a missile...ok...a street ...
by Shunt
Aug 18 2019 10:41pm
Forum: Battery Technology
Topic: bogus power supply?
Replies: 21
Views: 793

Re: bogus power supply?

I don't have any links or details, but I think Jonyjoe posted about them in various threads, as have others. Dunno what they're called, maybe "relay board" would pull them up? Basically they're generic modules from China that use a relay to shut off the output at a preprogrammed point, be that volt...
by Shunt
Aug 17 2019 11:05pm
Forum: Battery Technology
Topic: bogus power supply?
Replies: 21
Views: 793

Re: bogus power supply?

I have a giant Sorenson (and several smaller older ones) lab PSU, and it's great for doing testing with, but it's huge and bulky, not transportable. On the SB Cruiser trike itself, I use a single Meanwell HLG-600H-54A to charge my 14s2p 40Ah EIG NMC pack at about 12A. It's built into the trike; all...
by Shunt
Aug 17 2019 11:01pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20610

Re: Boston-Power Swing 5300 Li-ion cell test

I would think that large aluminum case is a pretty big deal too , since it dissipates heat to the outside of the cell much faster than a steel case would . If they weren't tabbed , I wouldn't even bother fooling with trying to weld one together , but since they are factory tabbed with nickel, it's a...
by Shunt
Aug 17 2019 4:48pm
Forum: Battery Technology
Topic: bogus power supply?
Replies: 21
Views: 793

Re: bogus power supply?

Yes those hlg units look better and better the more I dig into quality vs budget vs functionality. Thanks for your guidance guys.
by Shunt
Aug 17 2019 1:14am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20610

Re: Boston-Power Swing 5300 Li-ion cell test

OK ...I certainly will respond here. Since one issue with the BP batteries is a focus on price. I will sell BP Swing 5300's in quantities of 84 or more to folks on this forum for the price of $3.75 per cell, which includes shipping in the lower 48 states. (International shipping or places like U.S....
by Shunt
Aug 17 2019 1:10am
Forum: Battery Technology
Topic: bogus power supply?
Replies: 21
Views: 793

Re: bogus power supply?

In the end it would probably be more reliable and cost effective to buy 2 units, rather than try to find an all in one solution.