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not exactly, Mike. The way he does it is fine. The draw down from a weak battery is slow. When he switches to both, he gets the combined power of both batts. If one is weak, it will still be adding to total. If both are weak, at least he will still be getting the combined efforts. If you then run on both, and one has lost ability to hold charge, both batts will equilibrate to lowest voltage. So switching to both for start is fine. You just don't want to sit on both.
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