Another lithium question

[3274mike]

I am trying to decide between 18ah and 10ah lithium battery for helix 7.  I currently have a dakotah 7ah on my ice 55 love it. Has anyone had the marcum 18ah yet? It's price point is not far from the marcum brute 10ah and dakota 10ah.
I see the weight would more but wondering if the added cost is really much of benefit for run time. Thanks for any advice

[glenwyo]

Would the 18ah battery fit in your battery tray in your Helix 7 case? Seems like it would be too big. I use a 12ah lithium battery from Amped Outdoors in my Helix 7 and have fished for 9 hours without a shanty and I don't believe I have come close to draining the battery.