On board charger recommendation

I am considering the genius series. I am limited to space so the smaller the better for me.

I got a minn Kota 2 bank on my xpress. It's a little large but it was easy to install, got a good warranty, reasonably priced and works great. Can't ask for much more imo.

I have a marinco 2 bank 10 amp per bank charger that came in my boat under my console for the trolling batteries. its 4 years old with no issues and charges fast. I leave it plugged in as well 24/7.

I added a noco genius mini 2 bank 8 amp charger to the back cranking and house battery due to space. it works great and is small and compact. also at $100 its very affordable.

Not exactly what you're looking for but if anyone is interested I use a Noco solar panel to keep my battery topped off. It works well.

My advice would be don't go cheap, pay for a good one. Had a duel bank bought from Cabela's that would not switch to trickle when the battery was charged. Had the boat under the carport and the battery on the transom while I swapped banks because the trolling motor battery wasn't charging. Wired it up (correctly) and luckily had to bend down below the transom to grab the extension cord and plug it in. Apparently the charger running full wide open power evaporated all of the water from the battery and the second I plugged it in the plates arced immediately blowing the battery to pieces and sprayed battery acid in a 20ft radius. I have never felt a concussion like that, if I was not bending down behind the boat it could have been really bad.

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I learned that day batteries are not to be fricked with.