Hi and thanks JayTee, I had not seen that video.
It is the typical Lithium Battery B/S sales pitch.
First and foremost, find a single lead acid battery manufacturer that states their batteries should not be discharged below 50% SoC. They are either 20% or many of the newer AGMs are 0%.
Another point, base on the specs of the Redarc lithium batteries, which are just average, there are far better lithium batteries for a fraction of the price. For example, SolarKing are a fraction of the cost and have better specs.
There is lots more that that video incorrectly covers.
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