I build a DIY LiFePO4 12V battery using CALB prismatic cells and a BMS board from Electric Car Parts Company. They have a wide selection of boards both by configuration (how many cells), and by power rating. I designed my pack to be able to supply or receive up to 40A current continuous.
I found a drybag from MEC that has a clear vinyl strip down the side, to act as a battery bag. I fashioned two rigid plastic plates to form a rigid gasket for attaching the charger, motor and accessory waterproof plugs to the bag. A dessicant pack in the bag helps control humidity.
I've been using this pack (the power bag) for over a year so far. I've tested running at near 40A for short periods, and run at 25-28A for 2.5 hours without problems.
I found an ebook that discusses a lot of details of building your own pack. The author builds mostly for ebikes. https://www.amazon.ca/DIY-Lithium-Batteries-Build-Battery/dp/0989906701
I'm sure there are a lot of people around that will build custom battery packs for the ebike community, that could also build a pack suitable for an electric outboard to your requirements.
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Posted by: cpcanoesailor@yahoo.ca
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