Porsche Boxster S Approved starter battery

Good morning, I have a Boxster S 987 VFL with Approved. I don’t want to lose them. When starting the starter, you notice the heavy load for a few weeks. Now he stood in the garage for 2 weeks and did not manage to turn it so quickly to jump on. When bridged, he jumped directly on. Call PZ: Battery price 240 euros plus approx. 50 euros installation. A new battery from Bosch, minor etc costs no 100 euros in the accessories online. The exchange is done in 60 seconds. How do I keep the Approved and don’t have to throw unnecessary money into the garbage for “no mehrwert”. Thank you for your experiences.