Have you a digital multimeter?
After you've charged it, leave it overnight and then check the voltage. It should be >= 12.6.
With the probes still on the terminals, get someone to start the engine. If it doesn't drop below 10V while cranking then that's positive - if it drops much more then it's suspect.
I'm no expert but that's what I'd do.
TBH if it's a few years old I'd probably replace it. The battery in my 2017 MX-5 has gone flat a couple of times this spring through low use and me neglecting to leave it on the optimiser, and whilst it seems to be OK I'll probably replace it before we go to Austria in it in September.
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