I prefer a deck mount instead of replacing the lower portion (MBA ) with another.
Good price here - note the shipping too
https://www.boatandrvaccessories.com/products/powermax-pm3-60lk-12-volts-60-amp-power-converter-battery-charger-w-led-light?_pos=4&_sid=a37eb4405&_ss=rThere are other choices of course.
For the monitor that shows amps, there are many of them too. I have a lower cost one called "Renogy 500Amp" that shows amps and volts like you want for charging AGMs--or any other battery type.
BTW you don't have to yank your existing converter and put the deck mount in there. A deck mount can go anywhere handy--closer to the batteries the better. Does need 120v for it near enough for its power cord to reach.
