This charger is compatible with most lead acid batteries, including Calcium, GEL, AGM, and Wet types. It features multiple safety protections, such as polarity, over voltage, and thermal protection. It includes an LCD display and pulse repair technology for efficient battery maintenance. Price drops from $50.77 to $22.42 to just $19.42 when you add the code "USAFF3" during checkout. Shipping is free.