Elec trolling motor questions

[CG]

I have a small 10ft flat bottom aluminum boat that my grandson and I use to fish. Its probably a little small but we only take it on small lakes that dont allow gas engine powered boats. We've been using oar power the last couple of years and its a little cumbersome. I had electric trolling motor on my Christmas list and surprise I got the exact one I wanted (heh). Now I need a battery and some sort of small charger.

Its a Minnkota 40lb thrust 36" shaft. The manual reads 42 AMP draw.
Im looking at lithium batteries because I like the lighter weight. Looking on Amazon they have plenty under 150 bucks, some under 100 bucks. Im looking at this one.

https://www.amazon.com/ECO-WORTHY-50...0C49STP5P&th=1

Any input on battery choice for a small trolling motor? Ive never owned a battery I need to keep charged so Im also looking for input on a decent priced charger?