This is a replacement battery for YT9B-BS, YT9B-4, PT9B-4, GT9B-4, UT9B-4, MBT9B4 and WP9B-4. The SigmasTek ST9B-4 motorcycle battery is AGM Maintenance Free, fully charged and ready to install. The motorcycle battery offers optimal cranking amps, superior performance and is designed for motorcycle and power sports units, where high power output is required over short periods of time. The ST9B-4 motorcycle battery comes with 6 months warranty.