Battery Hookup new listing “Case 100x 3.3v 2200mah - 200x 18650 Lifepo4” for $100.00 + shipping

[sam_sam_sam]

You might fine this YouTube video about creating a BMS battery charger that use a micro controller and shares the score code for this project

https://www.youtube.com/watch?v=MRjxQVYBM_k. I have watched the first to video #8 I plan on watching the rest of his videos on this subject

[eccerr0r]

Well, glanced through a couple sections and it's exactly how I envisioned it, pretty much has the same concept except done via software as an all analog version I had posted somewhere. Yeah the digital version is nice because you can easily change the constants as needed. I don't think I'll be going this route, at most I'll probably manually balance if the bms doesn't already have a 100mA balancing function ...

Speaking of which I would have thought it should do the balancing current as a ratio of the capacity of the pack, other than heat dissipation I wonder why it's otherwise...

[eccerr0r]

and interesting... I have a chinesium 40A 4S Li-ion Co/Mn BMS that has 10 mosfets on it. The weird part is that it actually spent the effort and designed the PCB to dissipate heat from the balancing resistors...though still probably can't dump more than a few watts or so.

Too bad it's not good for Fe cells.

[sam_sam_sam]

and interesting... I have a chinesium 40A 4S Li-ion Co/Mn BMS that has 10 mosfets on it. The weird part is that it actually spent the effort and designed the PCB to dissipate heat from the balancing resistors...though still probably can't dump more than a few watts or so.

Too bad it's not good for Fe cells.

Could please take a picture of it I might have seen a board like that before because I am curious to which version of it is

[eccerr0r]

"2.3"

[sam_sam_sam]

"2.3"

Yes I seen this version before but in the 12.00 volt versions not the 16.00 volt one though

And yes you can modify the battery voltage configuration by removing the parts for that section and jumping it out

These are limited to about 100 milliamperes if I remember right


Here is the exact same board but it has a heat sink on the mosfets but there description is not correct it says that it is a Lipo 4 BMS balancing board but it is not according to the description it is a normal BMS balancing board because the voltage is 4.2 volts per battery cells I have seen this so many times in the past looking Lipo 4 balancing boards it is not funny anymore so you have look carefully at the board and the description given to know exactly what to expect when buying them

https://www.ebay.com/itm/18444123588...3ABFBM1KKEzMtl

Here is the 12 version of the same exact BMS balancing protection board with the heat sink on the mosfets

https://www.ebay.com/itm/18456777921...BNGDE3XGC05DHQ


Here is the balancing protection board by itself I think I going to buy one and see if it can be modified for a lipo4 battery cell configuration or not I am curious about this so I only have the balancing protection board function to deal with I have a 20 battery cell version but it is different from this one in the way it is designed

https://www.ebay.com/itm/18499192025...3ABFBMrqzwzMtl

Here is the 12 volt versions of the same design as the 16 volt version

https://www.ebay.com/itm/18499195532...MAAOSw6OhhEsfO

[sam_sam_sam]

Here is a tear down of the BMS balancing protection board that you posted a picture about

https://circuitdigest.com/electronic...st-and-working


Here is another YouTube video about a board that is very similar to the one you have posted but a slightly different explanation for this particular BMS balancing protection board

https://robojax.com/learn/arduino/?v...3S_40A_charger


With this in mind I wonder if there is a version of over and under voltage version that is available with a data sheet for what is needed to adjust the voltage parameters I not that I ever seen a version like this but this does not mean that one does not exist

Not sure what you need to use in a search engine to find something like this because several things I have tried have not revealed very much

[eccerr0r]

hmm. 40A seems a bit optimistic then... yeah heatsinking is necessary to hit 40A but it's on the wrong side of mosfets...