Currently have 2x 12v none lithium battery's for my 24v trolling setup.

They appear to be on their last leg.

I can replace those two with a single 24v lithium and still get the same 70lb of thrust but less run time ?

Whats a good budget option here. I'm leaning to just get 2 12v none lithium so I can keep using my noco 3 bank charger

If budget is the controlling issue, head for WM and get 2 - Group 29 marine deep cycle batteries. Last time I looked, about $100 per, maybe $110.

Alternate would be O-Reilly group 31 if you have room.

Yes a 24v - 100AH lithium would work and get close to the same run time. Budget would be an issue.

I run lithiums in my Skeeter, but budget was not an issue when I bought them.

So let's say 220 for a pair and they last have lifespan of x.

Is there a good lithium 24v 100ah they is around 300 to 400 hundred but had a life span greater then x.

While yes I'm on a budget I didn't mean cheapest options. Just can't pay 1k for the top quality lithium I see.

What's a good mid range lithium option.

I have two LiTime 100 amp hr 24 series with Bluetooth for my ultrex 80 works great.
Think I paid 550 for two .