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Probably these are grade b cells. Most likely they are cells that manufacturer sells at discounted price to this Alibaba battery vendor because they have external damage. How ever It would mean they are new cells.

I am also thinking why cylindrical cells are not rated 6000+ cycles since they don't need compression?

Or use threaded rod and springs at the end. Much more cheap than some specialty foam.

I don't think foam keeps constant pressure. More likely it acts like a spring, gradually increasing pressure when it contracts.

Are we talking about pouch cells here

I don't think cells rupture, if they are assembled with hard surface against them or in between them. Many have done exactly that and i have never heard of an example of cells rupturing. Also cylindrical cells do not need compression due to their shape. They can not swell much and yet they won't...

Which test/data you are referring to? I have seen a datasheet that shows 2500 cycles uncompressed vs 3500 compressed. And even then, capacity curve showed faster degradation to over 1000 cycles with compression vs uncompressed.

Yes, if you have beefy enough cables and busbars

Charge 404 A, discharge 808 A

Yes, there is no confirmation can the batteries connected in series safely. Even the maximum Charge/discharge current would be 25A it is still just around 960w. That is too close to the maximum power output of two 440w panels. And less than half of what that AC inverter you are going to use can...

Hi. I did not see any specs for the batteries. Based on quick Google search batteries look like a cheap lead acid replacement, and datasheet of 100Ah and 120Ah versions are supporting only 10/25A of charging and discharging current. (80Ah version even less) I'm guessing that is maximum...

Not necessarily, keep track of that cell during use. I would leave cells connected to parallel until final assembly

Ok. Thank you for this. Inverter does have a power switch and control port for remote panel. I think i will transfer my 12v timer/relay module to control inverter then. I only need to pull 12v from car battery instead of my Lifepo4 battery

Basically i have a setup where timer disconnects negative line (relay) between battery and inverter. Inverter is 2500w pure sine wave and load that gets disconnected is ~1200w. After relay disconnects there is a high pitched whine coming from the inverter. Does inverter or some components in it...

I am building a small 120Ah 12v battery, from those very common blue Chinese aluminium cased cells. ? During initial charging/top balancing to 3.65v I noticed cells swelling. They are 3-4mm thicker from middle compared from edge. iam guessing this is normal. I placed about 2 mm thick wooden...

Received my cells now. After messaging Xuba cells got forward. I guess they needed to clear some customs somewhere.

I ordered my cells over 60 days ago from Xuba trough Amy. Few days ago i received an e-mail that Amy doesn't work for Xuba anymore, and she offers to continue under her own company. I have not received my cells, can not even track them yet with UPS tracking code she provided. Alibaba marked my...

Regarding conductivity, aluminum has only 60% conductivity, compared to copper, but is cheaper and lighter (even more of it is needed to meet same amperage rating) so busbars cables etc need to be 40% thicker. On the other hand lifepo4 cell terminals are often aluminum so using same metal...

Thank you for the info. Do you or anyone have suggestion for better BMS hopefully under 20 €/$ ?During charging lid of the box can be opened if needed for heat dissipation.

I plan something like this for BMS https://a.aliexpress.com/_mNA3Rxd

Hi, i am asking for your thoughts and ideas about a battery build that i am planning to do. I am planning to build 120ah 12v battery pack to power a inverter and 1000w car engine coolant heater/waterpump in the winter. (And trolling motor during summer) My motto is cheap is beautiful :) I...