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Not worth it for a DD IMO.
I have used 5lb Shorai LI Fe batteries for motorsport. They do have limited reserve AH and require special care and feeding to keep them healthy. A well-maintained Shorai that lives on it's dedicated charger/maintainer while not driving will last 5 years easily. Run them down to 5 VDC once or twice and it's goose is cooked.
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2021 Cayman GTS 4.0L
2020 Macan (dog hauler)
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