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You are right about the cost about the li-ion battey. High quality Li-ion batteries of the same capacity could cost much more than gel cell batteries. That’s why I am going to buy one primitive looking 12V/9+AMP li-ion battery to see how it performs. This battery pack doesn’t have a hard shell, it’s wrapped in plastics. Like This battery on ebay
If it arrives, it’ll cost me about $36.
If it works well, I’ll try to get a quality one with hard shell. A good 12V/13.6AMP battery with battery status indicator built in might cost around $75. I guess this might be the kind of battery that Marcum checked out.
MarCum spec’d custom batteries. The testing with off the shelf LI batteries showed very poor results as the amp hours never seemed to live up to anywhere near stated capacity. They’ve not given up the R&D on this though. If a cost effective solution is out there to be had, they’ll find it.