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They're often recommended as good quality.
I'll be honest, I don't fully understand the whole cold cranking Amps thing properly. But from what I do, my engine requires a high ampage to turn it over, therefore, when the battery is a bit low it can prevent or make it harder to turnover. So when I needed to replace my battery it seemed to make sense. TBH previously I've just used whatever was cheapest...but that was also on a cheaper bike.
As mentioned the other thing that's good is the number, position and style of attachments. This sort of shows it, but usually there's a second set of terminals on the other side:
@DethBeard the MBTX9U looks a match, and is £35.99. What’s different about motobatt?