H7 group battery fits exactly, eg everstart maxx h7, but this type is not available where i am. Din 88 however is available. The battery tray will accept this size battery but will there be any problems? Operational and warranty problems? Maybe someone can share their ideas.

 

Many use replacement batteries from Interstate and others w higher cranking power/rating. You might do search for recommendations. One advantage is that they do not come w Porsche's annual milage requirement (6k miles /year) and will be prorated or replaced if they fail even if the car collects low miles.