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Do you have a multimeter & a battery charger? If so, here is a quick guide.
1) Check the voltage at the battery terminals - a fully charged battery should = 12.6v, anything less than 12 volts won't start the car and you need to put it on the battery charger for several hours.
2) With the engine is running @ +/- 1,500rpm, the voltage at the battery terminals should be 13.4 -14.3 volts approx. Anything less than 13,2 volts and the alternator / voltage regulator is suspect.
3) If all above checks out OK, then you have a parasitic draw which is flattening the battery - this could be as simple as an internal light left on in the front / rear boots or in the cabin, or alternatively an electrical fault elsewhere in the system.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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