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What's going on with the battery of my Zafira?

Hi. I drove my car, a 1999 Opel Zafira without a fanbelt for about 10km after which I replaced the fanbelt. The battrey that was discharged quickly charged itself. Some days later the battery discharged and even after I recharged it it still discharged again. So I replaced the battery after confirming that the alternator was ok and still am having the same problem. What can I do? Is there a possibilty that the alternator is not providing enough charge to charge the battrey? How can i test the charging terminals of the car with a multimeter to know if it is in order? Thanks