The guy makes some valid points in theory, but I haven't seen it pan out in real life.
I'll also note we are talking about a farm tractor with just two batteries.
I've worked on many large battery banks. Some with eight 6 volt batteries wired in series for 48 volts.
I've worked on large battery banks with the same brand and make 12 volt batteries all in parallel making 12 volts.
My home and workshop are powered by a huge bank of batteries wired series-parallel to make 48 volts.
Over the 20 years I've been working on large battery banks using Trojan or Rolls-Surette batteries . . . the average battery life has been the same for all the setups I know of.
I'll add that some of the longest lived lead-acid battery banks known to mankind are made of single-cell batteries hooked in series. Large 2.1 volt single cell batteries often wired in series to make 48 or 60 volts for remote telecom usage. They often last 20 years. But to be fair, they are expensive high-end batteries so longevity is mostly due to quality - not how they are wired.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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