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I will give a contrary view

When I first wired up my headways I did the parallel first and then series arrangement
The problem with this was that when a cell died (and some did) it killed it's neighbours so I had four dead cells

After that I used four separate strings with a "Batt Bridge" on each string

When a cell died I could immediately see it and disconnect that string

How reliable are your modules? - modules from a production car are probably reliable enough not to worry but "new cells" from one of Chinese companies seem to have a failure rate of about 5%
 
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