Smartpass 120S 12V all types WET,EFB, Ca/Ca, MF, AGM, GEL and Lithium Using a unique charge algorithm, CTEK Smarter Battery Chargers go through 8 steps to constantly read and communicate with your battery, charging only to its direct needs and therefore avoiding any possibility of incorrectly charging the battery. Furthermore, by ensuring the battery is conditioned as well as charged, your batteries last significantly longer. Moreover, each CTEK Smart Battery Charger regulates mains voltage to protect any sensitive electrical and hi-fi equipment. Now that's smart! See the visual demo of CTEK's world renowned 8-step charging process.