Going to a better will never hurt. Bring a voltmeter with you to the track and measure voltage before and after a session. But you’ll not be able the measure the amperage which also is important. A better battery should get you amps as well.
With that said, the battery might not be the cause of your engine getting past 12600. Check your plug and exhaust colors for a jetting issue. If you haven’t changed the exhaust matting in a while, that could be your cause.
LAD Specialties customer / tony kart / rotax / kt100