DIY 12V Battery Replacement Add'nl Info

Just going by the voltage, looks it's still ok. But considering the age, I'd get an electronic load test. There are relatively inexpensive such testers available, automotive retailers often have them and will test for free, and dealerships as well have them, but will likely charge you, somewhere between $50~100. If I was buying one today it'd probably be Solar BA9. Ancel is another popular brand.

 

heres some other health checks you can perform. but the load test as Mendel stated will be a good one to see how it performs with a load, similar to when your car starts up.

How To Check Car Battery Health At Home (8 Steps)