For those with a Cycle Gear store near by, you may be able to get a real Yuasa YTZ12S for 1/2 price if any are left in stock. Got mine for $62.
The YTZ12S is a 210 CCA battery versus 175 CCA for the the stock YT12A-BS and 230 CCA for the YTZ14S. The YTZ12S is the same size as the YTZ14S and is also a Gel cell battery. Both are slightly taller than the stock YT12A-BS which is a standard wet cell battery. The stock YT12A-BS can leak if the bike tips over or it is overcharged. Since the Busa does not use a battery hold down clamp, the taller size is not an issue.
The YTZ12S is a 210 CCA battery versus 175 CCA for the the stock YT12A-BS and 230 CCA for the YTZ14S. The YTZ12S is the same size as the YTZ14S and is also a Gel cell battery. Both are slightly taller than the stock YT12A-BS which is a standard wet cell battery. The stock YT12A-BS can leak if the bike tips over or it is overcharged. Since the Busa does not use a battery hold down clamp, the taller size is not an issue.