I purchased a Battle Born lithium iron phosphate 100 amp hour battery to replace our 84 amp hour lead acid. While the on-board charger will only charge it to about 75%, my 175 watt thin flexible solar panel with an MPPT controller will power it all the way to 100%, without any damage. While LiFePO4 batteries with management electronics inside cost more, they can be drained all the way to 1% state of charge without damage or reduction of power delivered. There are many new LiFePO4 100 or 200 amp hour batteries online via Amazon which now cost half of my original Battle Born, plus they weigh about 1/3 what lead acid do AND they last years longer. You pay more initially, but recover that investment over their lifetime easily.
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