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Originally Posted by jmatta
Personally, I wouldn't trust a three year old battery. These cars are very finicky when it comes to power supply, as my friend found out earlier this year in his '02 S. A low battery can cause all sorts of havoc with the ECU, let alone alarms, etc. Upon removal from storage, I would replace the battery, but you will need to drive the car for about a week before all systems are go again (DME ready codes).
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Do you replace your battery every 3 years?
There is no set age to replace a battery, too many factors influence it's life. You use a battery until it can no longer hold a charge. The battery isn't meant to run the car's electronics, it's meant to provide enough energy to spin the crank, provide enough spark and operate the fuel system until the car starts and the alternator can take over. There's nothing special about the Boxsters needs.