Dakota is USA sourced lithium and assembled here.
Hold that thought. I've heard and read it, but can't verify it one way or another.
The duracell AGMs are the best buy for sure in a lead battery,
No need to spend $2k for a full set of batteries and charger. I'm guessing you're 24V plus a cranking? I'd leave the cranking battery as lead. Two trolling motor batteries that will go all day will run you $1400 (amped 100 AH lithium). A four bank Noco is $170 and each bank can be set for the type of battery so no issue keeping the lead. There may be other options out there, but Amped and Noco are both high quality. Depending on your use, a pair of 80 AH for $1100 might be just fine for you. No doubt it is investment, especially if you have to fully replace what you have.
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Lithiums have their place. I run an 80 and a 30 in my Kayak for motor and fishfinder/lights. If I were running lead I'd be about 75 lb heavier. I carry the boat in the truck bed, so there is no way I could load and unload without taking the battery out whereas now I do. It would also put me right close to the weight limit for the boat between me and gear. Also since electric is my primary propulsion I couldn't deal with the slow down over the charge of the battery. I'd start dropping speed quickly and be at a crawl by the end of the day (short of going to a group 31 which would add another 25 lb). As in the video, well taken care of batteries will last far longer than abused ones. Making comparisons needs to be apples to apples. If you use the top 50% of your battery and charge it when you get home then your batteries are going to last a while regardless of chemistry. If you abuse your batteries you won't get the lifetime regardless of chemistry. The two main addages of batteries apply- buy the biggest capacity you can fit and charge it when you're done with it. If you follow those two you'll maximise the lifespan. At the end of the day though, for the same person using the same nominal capacity, and treating both equally, lithium will last longer and perform better for less weight. They are more expensive so its just whether that performance it worth it to your application.
My dad is also old and struggles (almost can't and definitely shouldn't) to pull his batteries out of the boat at the end of the season (he stores in a unit without power, so has to pull them for the winter). A 25 lb lithium is no problem, so I bought him one last year for birthday/father's day. He's also in an underpowered tracker (HP limits) so dropping 75 lb in the back end will help him for sure. Its not mandatory and he'd have continued with his duracells, but the lithium is better for his use. It also made for a good gift for someone who has everything or just gets the things he needs/wants.
thanks
rick