All right. Just a quick update on our Lev 60f cells. That's the model number. They're like high-powered Lithiumar and phosphate cells.
They're 74 amp hours. Uh, I'm gonna test to see the internal resistance because the spec sheet says that it's 0.7 0.0 Yeah, point this one right here. 0.7 Millions All right. So as you know, these come in these boxes and there's six per box, right? And they're brand new.
Here is my fancy internal resistance meter: No, No, no, No. So problem is that these studs are loose so they will have a lot. High Really high resistance. so you need to put a nut in there, tighten it, and then test it one hour later.
Right there we go. they're all half nuts and they're tightened. So there we go. Okay, so there's the first one: 0.59 milliohm.
Here's the second one: 0.62 Okay the third one. Point Six one. The fourth is Point Six Four million. the fifth is 0.66 milliohms.
and finally the sixth one is Point Six Four Point Six Four Millions These are legit. These are below what the internal resistance that is on the spec sheet. All right. Just for comparison, here's another cell that is a high power cell.
This one will do 200 amps without getting hot. This one's 16.67 milliohms. About 16 times more internal resistance in there. And these are the headways.
the champions of all. Champions when it comes to high power. 0.48 Milli Ohms. These things have very low, uh internal resistance just like the other ones over there.
And the Honda Clarity: 1.0 milliohms, right? Also, very, very powerful cells. And lastly, the Hyundai Kona cells. also very very powerful cells 0.4 0.39 million. All right.
For those of you who don't know what internal system says, that's a measurement of how much struggle there is for electrons to get in and out of a cell. The lower amount of resistance, the more ability for a cell to deliver all its power to the load, right? And the higher the resistance is, the more energy gets lost in heat by the electrons just struggling to get in and out. And so lower internal resistance is a must for high power. uh Lithium cells.
What's the price of thece cells?
Now i know 🤔 thank you sir,!
Where did you source the internal resistance metre?
WAAAWWWW?!
The internal resistance determines the rate of charge and discharge, it is calculated using ohms law, because resistance and voltage determine the amount of current (amperage).
Hi there when you do resistance on cells in a battery with cells in parallel the resistance is divided by the cells, so if you have 2 cells in parallel then the resistance will be harfed. If the battery's are in cerse then the resistance will be added
A few things to keep in mind. The resistance gets lower the larger capacity the cell is. Thats why these large cells show a lower resistance than smaller cylindrcal cells would do.
When you measure on a block of parallel connected cells you don’t get the value for the cell but for that entire block. You have to divide with the number of cells to get the average value of each cell individually.
Ok now I'm pissed. My headways all tested right under 1 milliohm. Yeah they are from 2015 but they were supposedly never cycled
Is this test should take when the battery are at full charge?
The LifePO4 cells are pretty nice, but I just can't justify $50 per cell for that capacity. It'll be interesting to see how these sell.
yea gs-yuasa don't play around.
That 16mOhm on that panasonic cell seems pretty far off. Most of my Panasonic NMC prismatic cells are .4-.6 mOhm
Wow, I asked for this this morning, and boom, here it is. What? That is faster service than a faster food restaurant. If you charge those to 3.28, those numbers should drop.
Thank you brother you are always the best 👍
Best regards from Philippines 🇵🇭☕☕