daromer said:Good work there m8.
You need to have very steady and tight connection between the meeter and the cell so make sure the cells are fastened to the table in some way.
Same goes with the Opus when comparing. Press the tab against the cell and you will get closer result (Im DiY tech and repairs )
Nice Video and good work.Abarth595 said:Just made my first video with the internal resistance meter as subject.
Hope you like it.
Yeah, totally! I was speaking in general, because I know not everybody is using their cells for Powerwall applications (mine will be for my E-bike), but I have taken advantage of fact that overall IR goes does with the number of cells in parallel... I hacked up a bunch of old LiPo cells to make one big battery. On their own they couldn't perform for a drone, but in parallel they can pump out a lot of amps for my portable charger. But it is definitely Frankenstein! It's 4S18P and makes for a handy little power bank.Though note you cant compare drone racing batteries with cells for a powerwall (I have raced alot too and started even before KK was defacto )
In drone racing we talk about 50-100C or even higher draw. On a powerwall we talk about 0.1-0.5C at most. Quite a difference in terms of IR
And yes temperature is a factor. If you start digging through you will see many of the threads taking up both temperature and IR. Wheres Ir is mainly used for weeding out bad cells as a start and i would say "never" used when building a powerwall pack. Note that many powerwalls have 100s of cells in parallel
But to end with it. They are key factors but you need to put them into relation to each other as well
In High current apps ir is key. In powerwall i would say cell self-discharging and or SOH is the key component.
And Welcome SurfGuruJeff. I bet you will learn alot and even worse. You will see how different the applications are