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Looks good to me.
Buy a 12V actuated relay to switch your 120V charging for charger cutoff.
I came up with some charging and Ah counting/fuel gauge code. It's pretty simple, actually. Look at my thread for it.
I suggest that you spend a few weeks with your new board and go through all the Arduino exercises like I did. You really learn a lot. It is simple programming language for us DIYers. Get a small breadboard and goodies like pots, LEDs, DIP switches, momentary switches, transistors, etc. It's a lot of fun. Then start messing around with simulation code for your LCD, making it look how you want to.
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