This just reminds me of a boat owner, who was also an airline Captain, wanting to take a life jacket with a gas cylinder for inflation on a flight who was told it was not permitted.
His response was 'Why not, there are already 148 of them under the passenger seats?'
There is a limit to the size of battery you can take into an airline cabin, it's 100Wh, or about 26000mAh at the standard power pack voltage of 3.7V. However that's not applicable to ferries. Anyway it's Lithium Iron Phosphate technology, which is the safe version of lithium technology, and won't generate a self-feeding fire like some of the other technologies.
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