Hi Leigh and some years ago, at least 8 years ago, I did come across a graph for Optima Yellowtop batteries, but, as you posted, it is almost impossible to get any additional info from Optima, beyond whats on their web site.
From “MEMORY” it was something like 1200 cycles to 0% SoC ( 10.5v ) and 2,000 to 20% SoC ( 11.58v )
I personally never “deliberately" discharge batteries blow 20% SoC.
I have tested starting many types of vehicles using an Optima D34 ( the one now being used as my wife’s Seca’s starting battery ) and every new vehicle I tested, started from the Optima, with a voltage of 11.58v or 20%.
The largest motor tested is my TDV8 and the Optima had no problem firing it up.
I have not tested this on a Toyota V8 yet.
From “MEMORY” it was something like 1200 cycles to 0% SoC ( 10.5v ) and 2,000 to 20% SoC ( 11.58v )
I personally never “deliberately" discharge batteries blow 20% SoC.
I have tested starting many types of vehicles using an Optima D34 ( the one now being used as my wife’s Seca’s starting battery ) and every new vehicle I tested, started from the Optima, with a voltage of 11.58v or 20%.
The largest motor tested is my TDV8 and the Optima had no problem firing it up.
I have not tested this on a Toyota V8 yet.
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