The Twin Power* High-Performance Factory-Activated AGM Batteries are the most advanced lead-acid type battery available. Supplied factory-activated, filled, sealed and charged, these batteries offer extreme vibration resistance, heavy-duty terminals and higher cranking amps. YTX-20H High Performance Battery, 18 Ah, 6-7/8 in. L x 3-7/16 in. W x 6-1/8 in. H