Thank' s to your reply and to glenn manikis, and this become a good discussion and I'm learning a lot.
copy past from the article link by jick.cejoco:
PASS/FAIL: BATTERY TESTING & SERVICING by BY BOB PATTENGALE
In many cases when a battery fails, the recommended exact-match battery may not be available, so a substitute will be installed to get the customer going. If the battery selected is smaller—less cold cranking amps (CCA)—than recommended, an overcharging issue may occur.
If the battery selected has a higher CCA than recommended, an undercharging issue may occur. In either case, this may reduce the life of the battery and create other electrical issues. In the case of the starting system, a higher capacity battery may be the cause of a starter that fails prematurely or causes mechanical damage at the pinion or flywheel ring gear.
may I know the take of our experts here...