EarthX ETX12A 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! ETX12A replaces YTX4L-BS, YT5A, YTX5L-BS, YTZ5S, YTX7L-BS, YTZ7S, YT5L-BS, YT7B-BS, YB7L-B, YB7-A, YTX7A-BS, YB9-B, YT9B-BS, YB9L-A2, YB10L-B2, YB9A-A, YB10A-A2