Hello, maybe the question was already asked, but I did not find anything suitable for it: Short history: Recently I have a few problems with my SpaceStar year 2003. Everything started with that I had changed the timing belt at 106000km in the summer. Then began to squeak in the first colder nights of the belt. I then went to the workshop and changed the 2 belts. Next I could not start the car any more, as the battery almost en Then I made the mistake and removed the battery and recharged it in the house again. (I didn’t want to read the car so openly on the road). From now on the problems started to really start. The idle speed no longer fits when it is warm and the window lifters no longer go automatically to or on after a longer press of the switch. I don’t want to know what still does not work at all. I now have some guesses. 1. The battery seems to be only poorly charged while driving, since after a week I have to recharge again by hand. (the battery seems to me to be relatively weak anyway (it is the first one), since from the beginning, when I had the air conditioner turned on, the terminal became darker at short notice). 2. The belts still squeak the first meters. (in the workshop they wanted to see if the tensioning elements were still working properly. n when swapping the belts?) Now to my question: Which battery should I buy (recommendation?). Can I install a stronger one so that the above mentioned problem with the light can also be solved immediately? Do I have to get back to the default values in the workshop around the idle speed (or the engine default setting)? The same is probably true for the window lifters) What does this cost me approx.?