x-Challenge battery

ADVENTURE said:

X-Challenge 2 years old in July, already had battery replaced last year on warranty. Hasn't been used over winter but was connected to an optimate.
Today won't start , battery will power ignition lights but won't turn over motor;

Questions are;
1. How do I know if battery is "up rated"?
2. Is any one else having as much trouble?
3. Should I just buy a different battery? And if so what should I buy / What will fit?

Thanks
ADVENTURE

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