If you do your research and are a little handy it is pretty easy to put together your own lithium ..... a LOT cheaper than the drop ins are being sold for. There are TONS of benefits to going lithium. It can be argued even at the high price for the drop in's that they are cheaper over time.
I am going all-in with lithium .... That I make myself for 1/3 to 1/4th the price. just not sure I will do the starting battery til I figure some more things out.
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Looking for the one that makes it all worthwhile.