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There is endless discussion these days here about the effects of calendar aging on cells. Even more so with cell cycle lifes hitting 15000 cycls or more. Unfortunately there is a lack large scale testing as it is both expensive and time consuming. Well through my job I was given a rare...

With this showing up on my feed at the right time I thought I would repeat the testing here with some more accurate gear that I have at the office Setup consists of the following B&K 9115 DC PSU set at 30V 30A Keysight 34465A bench multimeter TE 1.5kw 1ohm resistor I measured across a set of...

The first two results are in Up first CALB CA100, Manufactured Jan 2014 Original testing notes read: 110.8Ah at 0.5C Test was carried out as follows: Charge to 3.65v at 0.3c (30A) battery is charged when current drops to under 5A Discharge is carried out at 1C (100A), untill Cell reaches 2.5v...

A, they upped the capacity during trial production, when they announced it, it was 560ah. Really when you look at the dimensions and the specs it was a double LF280k cell, now it's a double 314 ah cell. If I had to guess it's to better compete with vision battery which announced a 580ah cell...

I promised I would do some coverage of the show earlier. Mainly I'm at the show for batteries so that's what I'm going to cover. My camera battery was dead so I really don't have any pictures. Power Long Battery Mainly a manufacturer of 26650 LFP cells. At the show they announced they are...

I hope to be able to come back and test this in the future. While these were outside cells, we also have a crate of L135F72 cells that havent been touched in years. Hopefully it has the original shipping report in it. I'm also looking at a set of original blue headway cells to test that have...

I have some some lab data on this. We were paid to evaluate cell replacements for a now discontinued cell. This will be lighter on details than I'd like because of it being private paid testing. At 15F the damage can be as high as 16% SoH after 10 Charge and discharge cycles at 1C/1C. Results...

Our test subjects have been found. They are a CALB CA100 manufactured Jan 2014, A CALB CA180fi manufactured Oct 2013 and a Brand new CALB CAM72 manufactured April 2019. Both the CA series cells have an original testing capacity written on them. The CAM 72 cell seems to have never been used as it...

Some quick Day 2 of the re+ show battery news and booths. A123 systems A123 was at the show with a mostly new product lineup. They've decided to move into the ESS space and were showing off a top to bottom lineup. They featured 280ah ESS cells available now, 300ah ess cells coming soon and...

With the caveat that I've not yet bought anything from your store but I have visited the site repeatedly. What I like, you are an official CALB USA cell distributior. It can be very hard to find proper cells from the manufacturers these days. I also like that the spec sheet is directly posted...

Final result in today, the the CALB CAM72 Testing was the same as the others Charge at 0.3C (21.6A) to 3.65v, Charged when current is less than 3.6A Discharge at 1C (72A) stop when cell reaches 2.5v. Final result was 70.062Ah, 97.3% of rated capacity. SoH is unknown as this is the first...

LMFP is Lithium managnese iron phosphate. It is an upcoming evolution on the current Lithium iron phosphate chemistry. By adding the managnese the working voltage of the cell is bumped up into the range of NCM cells, roughly 2.5-4.2v for LMFP. The cell also retains it's "non flammability ". This...

It's a BYD 3.2v 75ah cell, I don't have the exact model name. It's been cut from some sort of EV or Forklift battery. That Square on the terminal is what's left of the pack bus bar after they cut it free.

There is a large cycle life degradation even at 45C. EVE directly puts it in the datasheets. Normally it's around a 50% reduction in cell like span. For the LF280K it is 6000 cycles at 25c and 2500 cycles at 45c That 60C operation temperature is that maximum discharge temperature before...

Lithium Titanite Oxide based eclls -Long lived: up to 25k cycles -Not bothered by 140 eff heat: working temperature goes up to 60c for charge and discharge -Not bothered by use or charging when freezing: LTO cells work without heat down to -40c, 60% rated capacity charging ability at...

To add a addendum to the above I figured I would list who I know makes the cells and a bit about them if I can Altairnano/Yinlong/Gree The original producer of the cell chemistry. Started as a small US company producing the chemistry as 60-70ah pouch cells. They were bought out by Yinlong in...

These were the only new ones at the booth. Found out that the K indicated the cell was stacked instead of wound today. I was told that EVE is working on a capacity upgrade for the cells as well with no timeline. This makes sense as the 560k is rated at 628ah, which is 2x314. They also said they...

Some interesting thoughts on calendar life. First is on LTO cells, which is ofc not the main focus here. They are basically indestructible on calendar life aging. We have a whole pallet of the original Altairnano 24v 70a cells. They sat untouched for over a decade in storage. We refurbished...

Well chances are I was wrong, in a surprisingly turn of events I was looking for a cell and found it's likely the one there. The vent wasnt right to me, Catl uses a split ring vent and that didn't seem to line up. Further more there's a dot on the top case near the black terminal and the...

Next year then

To add to this, center charging/discharging lifepso4 batteries, just as you would with solar will make them last longer. We center tested some cells at work. They were cycled at ~25-75 soc. They just refused to die, we got >12k cycles at a way more aggressive profile than most people would use...

Current public date is Q2 2024. They are building a whole 60GWh factory for producing the cell in Jingmen, Hubei provence. Edit for the EVE LF560K

For the general purposes of this forum I don't think they are quite there yet, BAK in that flyer lists them as 3000 cycles to 70% soh. Sure that's useable but if you compare them to the lastest LFP cells out there they don't quite matchup. CALB for example was showing off their second generation...

Charge down to -20c, Recommend Less than 0.2c from 0 to -20c. According to 70ah ER sheet

Twelve thousand 25% Soc to 75% soc cycles and back down cycles. They cells themselves still had ~80% original capacity afterwards and they had basically stopped declining in capacity.

So officially by QR you received as far as I know, a L173F280a cell. I've gone and confirmed the image I posted with another source. I went through the data sheet to see if there is anything wierd and came up with nothing. For reference newer CALB sheets are wierd with raiting cycle life and...

If you wanted to DIY it, the heating pad idea should work. I do think though there are JBD or JK BMS units with built in heater controls, this way you wouldn't need all the extra Arduino logic. If you more wanted cells that operate below freezing (not necessarily -30c) there are a few options...

Before we get to much farther forward here, it would be good to know how the stud broke. Did the threaded part of the stud snap like some other people's recently or did the whole welded stud assembly break free of the battery terminal. It makes a difference in how you would attempt to recover...

I have a datasheet for the CALB L173F280a in the resources. It's mixed in with the whole collection of CALB datasheets. It's obviously for the 280ah version but it's the closest you'll probably get for awhile. On the qr cordes, If they are at all readable, I'd be interested in characters 6-7...

If you pause carefully at 1:12 you get a good look at the top of the cells in the production line. EVE doesn't not use round terminals on their 280AH batteries, least not in mainline production (I've seen octognal ones claimed as eve). Further more the dimensions of that cell at first glance...