Flat Battery - Gen 1 Cayman S

[halfpenny43]

So having been on my travels for work the past 3 weeks, and despite my wife starting the occasionally whilst I was away, the battery appears dead.

There was enough juice to open the doors and the front and rear luggage compartments. Opening the doors the windows dropped all the way down in small increments but of course won't come back up.

Looking through the manual, it says I can jump start the car normally. Would it be recommended to go for a replacement battery now ?

Any other tips ?

Cheers
Steven