Richard,
For welding you need appropriate voltage and current, say 24V and ca 40A. Your quote from ReadyWeld literature is correct in the sense that prolonged use of starter batteries will run them flat and possibly cause damage.
But then two deep cycle batteries, like Optima yellow top, while excessive for weekend greenlaning, are quite useful on an overland trip - try running a fridge for two / three days on a single battery. On top of that, you can use this capacity for all sorts of other jobs requiring constant load, including welding. All you need is to reconfigure the batteries from a parallel to a series setup (24V).
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Roman (UK)
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