Discharged Batteries A discharged battery can be recognized by low electrolyte density (one or more cells) and no starting capability. Sometimes the battery can be saved. Because of the high internal resistance for regeneration, a higher charging voltage with a current limit of maximum 2 amps is necessary. A battery maintainer as shown in the picture above can help reduce this the OEM part is available from your Porsche main dealer and is priced around $70. Other makes are available, make sure the unit is compatible with your car and is a battery maintainer!. These units can not charge a totally flat battery. You would need a charger for this.
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