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Some of those smart bms @ aliexpress provide beside Bluetooth also a seriell interface. Beside the typical protection features they also provide the voltage of each cell. Has anybody experience with one of them? My plan is to use one in combination with a raspberry pi to monitor cell...

Did not checked the details, but there are also some smart bms with rs485 around 70$. Maybe the rs485 provides the individual cell voltages.

Thanks for all the answers. You helped me so far.

I bought similar from BLS (aliexpress): 16pcs 130Ah to build a 48v battery. As written above they are shipped in a great package, very well covered, each in a box with foam, and the boxes additional in a foam in the package. My arrived well balanced, but I did an additional bottom balance...

Currently I have 16pcs of 130Ah 3,2V LiFePo4 cells (BTS aliexpress) for my 48v bank. I would like to increase the capacity. Sure I could buy another 16pcs 130Ah and build it up as shown in Wills video - first make single pairs and then serialize them together (assume it is named 2P16S) Because...

Hello Craig, I have the same in mind. First I thought to measure the cell voltages via OpAmps, multiplexer and adc controlled by Raspi. But then I found this - see the last 2 pages of http://electrodacus.com/SBMS100/manual/SBMSmanual.pdf...

Do I understand you correct: Just break this down to a single cell. If I put 2 x 130Ah cells in parallel, I get 260Ah; doing this with 130Ah and 190Ah I still get 260Ah and not 320Ah?

Is your intention to say: if I pair a 100Ah cell with a 50Ah both will have the same voltage (at a certain time e. g. 3.2V). Charging with 9A will put 6A in the 100cell and 3A in the 50cell. Same for discharge. Same if I put now 16 of those pairs in series to get 48V.

Just thinking: isn't the voltage which "handles" the over/undercharging - in other words over- and undervoltage? As the cells are parallel (not 2 individual battery banks in parallel ) they have the same voltage. Otherwise it would also not work with 2 cell pairs with same Ah (there is always a...

@electric: So based on your experience it should be ok to make a cell pair of one 130Ah and 190Ah. And put then those pairs in seriell?

What does the red light indicate? Is the cell charged or discharged?