That's a nice battery. Been running different lithium batteries for 4 years now. They last longer (more cycles); but they definitely aren't deep cycles; when lithium batteries get below 70% of their rating, they turn off. The light weight is a huge advantage and why I keep using them.

My guess is the draw will be around 1.5 amps depending on brightness setting and how often you run autochart live.

Ballpark 7hrs of runtime would be my estimate.

Will you be using an arm for the transducer or mounting to the bottom of the hull? I�m interested in getting an SI too but would like to know if side imaging works well with a transducer arm (my current setup).

I went with the nocqua 10ah battery. First time with a lithium so we will see. I�m thinking it might take two batteries to last a full day though. I�ll check the draw of the ff when I get a chance.

Be interesting to see how long your Nocqua 10AH battery lasts. Based on the Humminbird website your Helix 7 SI should draw 800 mA.

Depending on how low you're willing to draw the battery down I'm going to guess about 6-7 hrs.