7 STAGE CHARGER: This is a full automatic battery charger with 7 charging stages, the applicable battery range is 6‑200Ah, which is efficient and durable. APPLICABLE BATTERY: For calcium battery, gel AGM battery, lithium iron battery and wet battery, helps to restore depleted and sulfated battery. GOOD PERFORMANCE: This automatic battery charger has high sensitivity and stable performance, compact structure and convenient installation. SAFE OPERATION: Automatic charging prevents overcharging of the battery, allowing the battery charger to be connected to the battery indefinitely. CIRCUIT : This battery charger has polarity , output short circuit, non battery link, over voltage and over temperature .