300/440/550 Do I need a new battery or could I be having another issue?

So here is the situation... I have a 440 and when I try and start my ski all I get is a 'click' noise. I have determined that my starter is in working condition by connecting my cables to a battery charger that has a jump setting and it will turn over strong.

I brought the battery to Walmart and they told me the core is okay... what could potentially be my problem? What battery do I need to have in my ski? Could mine not be powerful enough?

Thanks for your help.
 
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