A quality AGM - around $700 to $800?
Lithium 125 Ah around $1700
So, a bit over double?
To me, well worth it for the life expectancy alone, but add in the lack of Voltage sag, constant Voltage and major weight reduction, and it is no comparison.
Most people seem to forget the Voltage side of things - no fridge turning on and off, compressor working properly, etc.
Cheers
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