Thanks for the info PK 👍
Both motor and ESC are good for 12V.😀
I don't know what boat you are putting this kit in, or the size and type of prop you have fitted, but with a prop max 40mm diameter, and perhaps 1.2 to 1.4 pitch, I wouldn't expect the set up to draw more than around 20 -25Amps max. So fit a 25 or 30Amp fuse in the + supply lead to the 1060 ESC.
Especially because "Do not allow the motor to stall as it is likely to overheat quickly ... current can easily exceed 40A-50A under load and could hit 80A if stalled at 12V." Fitting a prop larger than 40mm will most likely just increase the load and thus current draw with improving performance. If the fuse keeps blowing increase it to 50Amp MAX, giving a safe margin of 10A to the max continuous current of the ESC.
If you don't want to get into LiPos you could use two 5 cell NiMh packs in series, giving 12V.
Having two smaller packs instead of one big lump helps with mounting and trimming the boat.
One pack either side of the hull helps to dampen any tendency to roll, especially if you only have one prop! The infamous 'torque roll' !! Get the highest capacity (xxxxmAh) batteries you can without sinking the boat! Use 'em as ballast - better than 'dead lead' 😉
Hope this makes sense and helps😁
Please post details of the boat / ship, maybe in a Build Blog?
Good luck🤞 Cheers, Doug 😎