EarthX ETX24D Blue Light Weight LiFePO4 Complete Battery (with Battery Management System for Performance And Longevity) Extremely Light Weight, 70-80% lighter than a lead acid Very low self-discharge rate, can sit on a shelf for a year! Environmentally friendly, no acid or lead. Will not sulfate, corrode, freeze or boil over! Maintenance free. Fast Charging! Higher starting voltage means faster, more powerful, starts! ETX24D replaces YTX20-BS, YTX20L-BS, y50-N18L-A, YB16-B, YB16CL-B, YB18-A, GYZ20L (use ETX36D for Harley's or Buells)