Q: battery light just whent on? on 1991 BMW 325i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
should i just change it ? is that any way i can test the battery ?
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i wanna thank you for checking the alternator ,u mean i will have to take it to a mecanic,or is that anyway i can check it for my self and how?