First off, Great Job on your cooler designs and site! Very impressive!! Planning on buying one of your kits and building a unit.
Have used small 12v batteries in past for trolling transom mount trolling motors on my boats. Great run time. Do you have a recommendation / preference on which power source (12V Lithium vs 18V Ryobi) for longer run time?
Thank you for your comments.
For long run times, definitely go with the 12V power cells.
I’ve had really good luck with Bioenno Power: https://www.bioennopower.com/
Their 12 Ah battery runs my grey and orange cooler over 7 hours on a charge (longer than the ice lasts).
Since you already have deep cycle batts for your trolling motor and if you don’t mind hauling them separately from the cooler, maybe you’d want to just have a lead with alligator clips coming off the cooler and use what you’ve got.
If you want everything self-contained, consider the battery I used with one of Bud Industries watertight cases that you can mount in the cooler lid like I did – it works great.