I replaced my trophy’s battery a year or so ago with a Motobatt version from Tayna. They were the best price I could find at the time and the trophy certainly spins the starter motor faster than the old battery did. However it was about 17 years old. I just had a look at tayna for the battery I used and it’s shot up in price and I can get the same battery from wemoto cheaper (I think it’s the same but they don’t seem to give the battery id, just the specs). It might be worth checking them out?