Recent content by Sparfuchs

hmmm, as far as I know max. 0,1 v difference is ok ? That's why I charged all the cells below 3,53v and checked every 3 minutes so they don't get over about 3,6v. So I thought, they are now balanced enough :( But even if I'd have a charger that can be set to a max. voltage of 3,6V I would not do...

here is the thing... I've 392 cells, all between 3,53v and 3,63v sorted by voltage. Now I'll place them in cell holders 14 groups serial of 28 cells in parallel. Is it without any further tests absolutely irrelevant how I place them (according to voltage) or something to consider ? Edit: If it...

So IF! this are all brand new cells, that were all about the same Voltage when I bought them (didn't check back then..just assuming from all the other "reclaimed" cells I had and checked for now), how it comes that some of them do now have way lower voltage then the others ?! If the only thing I...

I'm so thankful for all your great help ! Just one question left: I checked all the 400 cells for internal resistance and voltage and had to charge a few of them a bit so they are all between 3,53V and 3,63V (I marked those cells to spread them in the paralell groups just to feel save). Now all...

If my new "understanding" is right would that mean: If I made sure the internal resistance of all my cells is fine and have to build the pack just by knowing the voltage, it would even be a really bad idea to put all 3,4v cells together in a parallel group because there is a good chance those...

I just did a try at repackr with a fictional 7s3p battery pack with values from 3500 mah to 3600 mAh (+5 mAh each) and it seems like it's not about heaving as similar mAh values of each cell in the parallel group, but about heaving as similar mah values of each parallel group in the pack right ...

I just read a bit and realized that even a good charger/discharger/testers have to fully charge them and then discharge them to know the mAh of each cell, am I right ? I've 400 cells with a average voltage of 3,5v -3,6v at the moment and I absolutely haven't got the time to charge all 400...

So now I've got the 400 cells I bought and WILL use 392 of them however their quality is. I do also have the mentioned Miboxxer C8 smart charger, a multimeter and soon the YR1035+ resistance tester. I just want to get the best result with my given options. So could anyone give me a "step by...

Thank you so much for your detailed reply Harrisonpattm, I've already built many battery packs with reclaimed cells and the work great for now. But as the cells were all the same voltage (+- 0,02) so I didn't consider (and also didn't have equipment) for further tests back then.

Thanks a lot for all your helpful replies !!! I just ordered the YR1035+ with a slot for cells to make it easier to measure (picture below). So I'll check all the 400 cells but how do I use the results ? As it will be a 14s28p pack I'll have 14 different "voltage categories" so I can combine...

Hallo EV friends, I'm about to build a 14s28p battery pack with "reclaimed" (sellers definition of reclaimed below) 21700 samsung 50e cells. my main question is if there is a "best" cell combination order to consider by knowing the internal resistance and the voltage of each cell if they...

well, your battery is a 21s 97Ah battery..mine is a 19s 16AH battery. I really doubt that you've ever had even approximately voltage drop to avaluate what the sabvoton does in my case, right ?

I've some more questions to the bypass mod: So this sensors in the controller only measure the amps of two phase wires to the motor, right ? So does the controller know by calculation/physical law how the phase amps are related to the drawn dc amps or how does it make sure it uses my dc...

I'm not that sure anymore if this solves my problem because even if I bypass the sensors it will still notice the voltage drop and might lower the output until "it's happy" with the drop. So if it now reduces it's phase amps at big voltage drop for example by 50 amps, isn't it likely that if I'd...

I do use a adjustable charger and charge it to 4,1v per cell with 24amps. When it's done I charge it to 4,16v per cell with just a few amps. Seems safe and good for for cycle life to me and is definitely fast enough :)