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Well said, i see a lot of lithium 'peddlers' touting 'drop-in replacement' and for automotive thats not the case. as for me, after changing our old 2-stroke 115 for a 100 4-stroke, to get some weight out of the stern i have ditched the 21 kg cranking battery and 25kg 100 ah deep cycle for a 3kg...

not sure if it has been mentioned but a few people are putting in supercapacitors for starting or assisting starting with a lithium battery 'behind' it. have a look on FB - one particular site is FPV-Power