To be honest, if it starts your car, it's fine!
I have a normal battery in my MGB - it's been there since I bought it so at least four years old. Due to a (now rectified) wiring issue, I have completely drained the battery at least 6 times or more. And I mean completey - not even enough juice to light the LED interior light. Every time, I've jump started, let her charge on the alternator and she's still good - and is still starting fine on these cold mornings.
