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Can you tell just by looking at a picture if a cell is poly or mono? This is a portable solar panel and they claim it is using mono cell so does it look like a mono cell to you?

I have this DC MCCB and there is no printed polarity on the terminals. I bought it thinking it is not polarized so can use it on my hybrid inverter but when I asked the seller he said it is polarized that I should look at the terminals but there is no polarity signs at the terminal. I asked on...

Do the vents on Prismatic LiFePO4 cells a one time use or do they pop back to its place when the pressure inside the cells are released? I have read someone saying that you had to compress the cells so that the cells wont bloat and because it is compressed the pressure will be vented out. I...

I bought a 12v 100ah lifepo4 battery and after capacity testing I only got 97.xAh. I opened the battery and tested each cells and 3 cells has only 96 and the other one is 97Ah. The seller said their batteries are new and it is normal for their batteries to have 5% deviation. I always thought...

What exactly is the reason why some battery manufacturers say that their batteries cannot be connected in series while some say you can connect it in series? Is it a limitation on the BMS or something else? This is a sample lifepo4 battery that is being sold in our country.

If you cannot find the manufacturers discharge rate of your cell. Is there a way to possibly guess the discharge rate of the cell? Maybe by trying to discharge the cell and then slowly increasing the amps pulled by the load while monitoring the voltage sag? But how much voltage sag is too much?

Here is a video that I recently watched on this video he talks about that discharge rates for paralleled batteries will be proportional to the capacity of the battery. Lets just say that what he said is true so my question was what affects or dictates that the smaller battery should only...

Some datasheet that I have seen says that after reaching its max cycle that it will have 80% of its original capacity. And then some articles I have read says that they replace their batteries when the total capacity of the battery is down at 80%. My question is if it still has 80% of capacity...

What would be the pros and cons of having lots of paralleled 32650s to get 102ah vs 1 100ah prismatic cell? I am planning on building a 48v 100ah battery. I made some calculations and I will need 272 pieces of 32650s to build a 48v 100ah battery vs just 16 pieces of prismatic cells. Pros of...