CTEK MUS 4.3 Battery Charger Review

Unlike my old 3300 CTEK, the first step of the MUS 4.3’s 8-step process is to diagnose battery health and desulfate older batteries. The exclamation mark in the upper left corner illuminates if the charger is incorrectly connected, if the charging cycle gets interrupted, or if the battery is too sulfated or too old to accept a charge.