I've been using 2 m18-9AH Milwaukee batteries for years to power both Garmin Echomap 93sv and the live scope black box. I've never had any problems. 2-m18-9ah batteries last all day. The battery adapter can be purchased for much less on eBay. The only drawback to using 2 Milwaukee batteries is after each fishing trip you have to charge 2 batteries. Also if you draw the batteries down too much they won't charge back up ouch. I've had 2-m18 chargers quit working. I left the batteries on the charger too long I guess. I don't do that anymore. If I were to set it up again. Id use 1 battery bigger than 9ah. With the charger connected. Then I could charge the starter battery, the trolling motor battery, and the live scope and Echomap with 1 cord. I may do that some day.
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I have a 93sv and a 50 Ah lithium battery. I get at least 3 full days out of it. I fish river systems a lot, so a lot of time I am fishing from daylight till dark. A lot of times we are simply searching for new brush, new step down ledges and underwater cut away that crappie stay on in river systems. Sometimes we are simply searching for bigger fish. So 50 Amp battery does fine. I am not a techie type guy but it seems if the screen is larger they tend to drain the battery sooner. As my BL has a 12” screen fishing the same way, he has a designated 100 Ah and he can get about a day and a half to two full days.
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