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'99 Boxster winter storage - car wont start

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After a 4 month winter storage, I am unable to start my '99 Boxster. I noticed the battery was drained and there was no power to the car - therfore I took the battery out (original Porsche battery) and charged the battery for 16 hours with a charger. Upon replacement of the battery, I have power as the instrument cluster lights up and all controls (including windows) seem to be working, but upon turning the ignition there is a clicking noise from the rear but motor is not turning over. Also after the ignition key is taken out - the odometer (mileage reading) and time clock continue to glow in the on position.

Prior to storage car the boxster is in excelelnt running condition!

Should I replace the battery with a new one?


thanks in advance for the responses

Bobby1! :beer:

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You have some bad cells in your battery, residual power is causing the clicking (your starter struggling on insufficient power) and allowing your lights to come on. You need real cold cranking amps to turn the engine over, which you don't have anymore. Take the battery out and have it tested; 99% sure your battery is shot.

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The best way to ensure maximum life for a battery is to maintain it fully charged. Once a battery is partially discharged, about 70% or so, the cells begin to sulfate.

This is permanent damage that diminishes the battery capacity.

The sulfation rate increases with warmer temperatures, also on partially discharged batteries.

There is no down side to keeping a battery connected to a properly adjusted voltage regulated and current limited charger. For example, for a flodded cell lead-acid battery, it is acceptable to maintain this with a power supply set to 13.8 VDC.

This maintenance requires that the cells are periodically inspected and topped-off with distilled water. That requirement also increases with increasing temperatures.

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