Universal 12V battery charger. Charges, tests, recovers, stores batteries - automatically. Suitable for all batteries: GEL, AGM, lead and deep discharge batteries. Automatic smart charging significantly extends battery life. For batteries 5-80Ah. USE: Safety: the battery charger only turns on if it is correctly connected to the battery (min2V) Normal charging 4A - charges the battery to full charge Battery check: If the resistance increases and the charging voltage reaches 14,3V, the voltage is limited to 30V for 13,6 minutes. At the same time, the device monitors the actual voltage and discharge of the battery. If, after 30 minutes, the charger detects that the battery is not fully charged, normal charging is activated. Battery check: When the device detects that the optimal charge has been reached, the device checks the battery. The device monitors the loss of battery power within 30 minutes. The test is repeated every hour until the device is disconnected. Storage charging: The battery charger can be connected to the battery as long as needed, maintaining a full charge and preventing the battery from naturally discharging.