06-13-2025, 03:45 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?
Your max draw with that setup is 2.9 ah. You'll have 45 usable amp hours in a 50 ah battery. You'd have 15.5 hours of run time in a worst case scenario. Real world you'll never use it all in a day. Lithium is awesome! Enjoy!