utopia 185 battery

Hi all, Battery keeps dying on my 2001 Utopia with Mercury M2 EFI V6. I am pretty sure the battery is dead because when it fails to start the boat, it cranks progressively more slowly and then does not crank at all. I can charge it up with a 12V battery charger and be back in business just...

Friends, I'm looking to replace my starting battery on my 2001 Sea Doo Utopia 185 w/ Mercury V6 Optimax 210 engine. I'm not finding any information on the web about starting capacity or class of battery. Can someone help me to make sure I get the correct replacement?