I use a 12 v. Power Drive V2 MK with ipilot and have 2 series 31 batteries. Going to replace with starting out 1 Iconic 100 amp lithium as all the forum discussions on bbc forum, the bass guys are using 2-50 amp for 24 volt TM’s ands 3-50 amp batteries for their 36 v. Trolling motors and having plenty of battery left after fishing 10-12 hr days. One guy is posting he is fishing 16 hr days practicing and fishing and not running out. But, I do a lot of longlining and want to see if 1 battery is ample and if not, will add another in parallel. Lithium batteries are like your drill batteries. They don’t run down slowly, they just die when depleted and your current draw is constantly the same volts unlike your wet cells or agms. And your wet cells pretty much loose voltage when you use more than 50% of its copasity. For the motor, just using a small car starting battery for boat electronics and starting 25 hp Yamaha Motor, and for electronics a 50 amp Iconics, as my helix 10 MDI G3n draws 1.2 amps/hr, my 9 MSI g2n draws 1.0 amp/hr, the 7 MDI g3n for 2 d and charts will draw 0.8 amps/hr, the Mega 360 will draw 0.5 amps/hr, and the network draws less than 0.2 amps/hr all for a total draw per hour of 3.7 amps per hour divide into 50 amps gives you 13.5 hrs of usage. If you have battery chargers that have a AGM charging setting it will work for charging fully lithium batteries as I do have a 2 bank plus I did pickup one of these from amazon.com for the 50 amp. https://www.amazon.com/NOCO-GENIUS10...NsaWNrPXRydWU= . All your other chargers will not Fully charge a lithium as your chargers need to charge at above at least 13.5 amps and no more than 14.6 amps. One interesting thing I have asked 3 different makers of lithium batteries and and they all gave me the same answer is with lithiums in using them in parallel hooked up, they do not have to be the same size and will work perfectly in parallel so if run out of power in a full day of fishing, longlining jigs or cranks, I can add a 50 amp to the 100. Weight wise, the 50’s weigh 14.4 lbs, the 100’s are 28lbs and my 31 wet cells are 75 lbs each in replacing 3. Drop the6 gal gas tank to 3 gal as I seldom ever burn 1 to 2 gal. I can always throw the 6 in if going to run a lot and the weight savings is approx 225lbs with some of the other items removed as well as increased storage in downsizing the size of these batteries. One more important fact is Iconic batteries have a phone app, that is blue toothed to the batteries, it will show time to charge and these batteries charge 2 times faster than wet cells, shows power consumption and time left to use power as you use it, shows volts your drawing as well as charging and is in real time. Wet cells can also loose 30% of their power per month just sitting when not used vs 1 to 3% monthly loss for a lithium when in storage. 5 yr warantee on them with a min. Life cycle of 10:yrs. 2000 to 5000 cycles in charging life and if you only need to put a 50 or 60% charge on them a cycle doesn’t count till you have done a 100% total charge time so how many times a year do you charge a battery? I’m lightening my load, not ever messing with adding water any more, not worrying when I am going to have to replace them again. And don’t care if I knocked one over with it being lithium. Yes they cost more, but the technology is here now for Marine batteries and the prices are coming down.