well in the publicity for this battery Varta say......also perfect for stop/start application .....so obviously the ability to accept the greater discharge explains the longer life expectancy as that is what shortens the life of so many standard batteries
as far as I know charging rates are standard , these improved batteries and longer lasting starter motors are all that is required
I suspect most 8's are not used as daily drivers , so having a battery that can be discharged to a lower voltage without damage is a distinct advantage !
incidentally , I notice that the latest Bentley uses this battery , and that is design to stop the engine when driving slowly !
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