I dont really know a whole lot about this either.....butttttt....im with the ones that said as the batteries wear out go bigger. And on that I can say on my behalf that the "Blue Top Optima" has not let me down. I do know they PRICEY but I lucked up and mine was in boat when I got it. Its a 18' Express, 80 lb MK, and I dont know if Ive ever took the meter down half way in one day.....That's my TWO CENTS thats worth about a HALF A PENNY
John 21:6
"Cast your net on the right side of the boat and you will find some." When they did they were unable to haul the net in because of the large number of fish.
Maybe we are just on the wrong side sometimes.....