I've been using a 18Ah Amped Outdoors battery for 3 months now and have been very pleased with the results.
My buddy that I fish tourney's with has been using the 30Ah for about the same amount of time and hasn't had any issues either.
I am strictly running my live scope and my 1022 with this battery and my other electronics run off my starting battery.
I also installed a designated toggle switch to turn unit and box on once I'm on the water.