Porsche released news that it is the first car maker in the world to offer a starter battery with lithium-ion technology. Weighing less than 13 lb or 6 kg, the new battery is more than 22 lb or 10 kg lighter than a conventional 60 Ah lead battery.
The new lithium-ion battery will be available as a $1,700 option as of January 2010 for the 911 GT3, 911 GT3 RS, and Boxster Spyder and is delivered with the car.
The new battery was developed specifically for lower weight. It is the same length and width as the old battery but is 2.8 or 70 millimeters lower, Porsche notes. The fastening points are completely compatible with the old battery.
Additional enhancements include a faster charge due to reduced internal resistance, a greater number of charging and re-charging cycles and a lower self-discharging effect and a longer service life.
In a press release, Porsche notes its lithium-ion battery comprised wound film of carbon and iron phosphate with a ceramic film moisturized by the electrolyte that serves as a separating layer. This compares to other lithium-ion batteries that use a combination of manganese oxide, cobalt oxide or nickel, this lithium-iron-phosphate battery, as it is called, offers advantages when used as a starter battery.
It is robust and consistently guarantees the usual voltage of 12 V for the car’s on-board network. The lightweight battery is made up of four cells and integrated electronic controls.
This battery management system protects the battery from major discharges and guarantees a consistent charge level within the individual cells. Once battery voltage drops below a certain threshold, a warning signal reminds the driver to re-charge the battery either simply by driving the car or by means of a conventional battery charger.
The new lithium-ion battery will also be available for retrofitting from February 2010 on the three models mentioned from Porsche Tequipment.
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