Looking at a 12v 300amp battery to run bait tank pulling 3.8 amps plus a Garmin8616XSVpulling up 6.0 amps/hr. Would this be a good setup?

Looking at purchasing 12v 300ah to run bait tank pulling 3.8 amps along with Garmin 8616XSV pulling up to 6.0 amps. Also purchasing the starting battery along with a DC to DC charger to charge the two batteries off a Honda BF 200. Would this be a good setup? Already have the 36v 100ah for trolling motor and love it.
 
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