06-14-2025, 05:45 AM
(06-09-2025, 09:42 PM)Kent Wrote: I have always had my fish finders attached to my starting battery. When I am vertically jigging, trolling or fligging I like to leave the fish finder on. If I leave the fish finder on longer than ~3 hours I get concerned about running the battery down too low to start the outboard, so I usually switch off the fish finder. I always carry jumper cables and a jump-start battery, so I am well protected, but I still prefer to not take any chances. I am going to begin using a separate lithium battery to power my fish finder. I currently have a Humminbird HELIX 9 Chirp MSI GPS G3N fish finder. I'm not sure how powerful of a battery that I need to install. I realize how bright I have the screen has a major impact on power draw, so I try not to have the screen any brighter than necessary. Does anyone have any experience in how long a 50 Ah would power my Humminbird?
For the last three years I have been running my Helix 10 Mega SI DI G2N on a LiFePO4 12.8V 20Ah when icefishing. I set the unit to ice fishing mode and after 8hrs on the ice the battery indicator on the fish finder still shows a full battery. I have never had a problem running 8 hrs on the 20 Ah battery so 50 Ah will last all day.