If you want to debug your battery pack, there's an "official" way.
BMS collects statistics and many limit values, including min cell voltage, max voltage, max current and max voltage difference between cells.
So, before testing, simply use windows app to clear statistics and have a ride. Come back and check your values. From those values you can calculate min and max internal resistance of your cells, see how much it sags, etc.
I know it's not the same as seing every cell's live data during your ride, but you really don't need to. Also it would be very unsafe, if done on road.
Another option would be to have a laptop in your backpack, connected via bluetooth or even USB. This way you can log every cell and have some nice graphs later.
Also, communication protocol is available to public, so you can have a raspberry or other weapon of choice to log it over UART (using bash script, etc).
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