YTZ7S 12V 6Ah Powersport Battery. Replaces: YTZ7S, STZ7S, APTZ7S, YTX5L-BS, YTX7L-BS. These batteries are one of the most trusted and highest reviewed sealed lead acid batteries on the market. It's rugged construction is made up of non-conductive ABS plastic which is resistant to shock, vibration, chemicals, and heat.