[iseanstevens]

Lead acid are not particularly great as far as DOD (depth of discharge) or longevity.

Comparing for example a 100ah lifepo4 to 100ah lead acid, the useable capacity of the lithium will be close to 4x more. Using the full capacity of the lead acid will make them wear out quickly.

[dylan604]

What about the deep cycle batteries that are designed specifically for full discharge? Or am I believing marketing? I have a couple Optima Blutops that I've built a remote cart off of, but I don't use them nearly as much as the market they are targeted which is fishing boats. Run your pumps, gadgets, and trolling motor all day on the water, then charge them back up over night.

[lazide]

You'll still be lucky to get 300-500 cycles out of them if you go down to 20% charge or so. A 'Normal' car battery can fail in 30-150 cycles if you do that, hence the 'deep cycle' part of it.

Fine for a trolling motor, but if you're deep cycling them in a power system, that could kill them in a couple years. Usually you'll want to size them so you never go below 50% discharge on a normal basis.