Originally Posted by
the evil twin
Thought I would add that unless you operate in extreme temps a lot of the advantages of Crystal (and some for Lithium) are moot anyway.
For example
-there is no point in having a Battery that will perform down to, say 4 volts, when the equipment you run off it shuts down at say 11 volts due to low voltage sensing or will be damaged by excess current.
-there is no point having a battery that will take a charge acceptance rate of, say 50 AH over one that has 30 AH when you have a solar panel array that only supplies say, 10 AH.
If that is the case a quality AGM will do the job of the Crystal at a considerably lower cost.