Product Features 1.1 Application Range Suitable for 1~4 pieces of AA / AAA Ni-Cd or Ni-MH batteries 1.2 Microprocessor Controlled 1.2.1 Automatically cut off power The charger stops charging once the microprocessor detects the batteries are fully charged. 1.2.2 Timer Protection For safety use, charging termination is also controlled by timer. 1.2.3 Defective and Non-rechargeable battery detection Safety Protection for using the charger if you attempt to charge defective or non-rechargeable batteries, If you charge non-rechargeable and rechargeable together, detection may not work properly. Charging rechargeable alkaline batteries may result in battery leakage. 1.3 Other protections 1.3.1 Reverse Polarity Protection Protects the charger and batteries against incorrectly installing batteries. 1.3.2 Over Current Protection Maintains constant charging current during the charging cycle. 1.3.3 Over Temperature Protection Protects the batteries from being damaged by overheating, the charging will automatically terminate when the temperature of charger or battery reach to 65oC + 5oC. 1.4 Low Battery Leakage Current If the battery charger is not connected to AC power and the batteries are left in the charger, the charger will discharge the batteries in a certain amount of current. 1.5 Trickle Charge After Full Charge After batteries are fully charged, there will still be a small pulse charge current applying to batteries. 1.6 Refresh function The charger has the pre-discharge function, when the battery is discharged to 1.0V, the charger can automatically switch to charging status to charge the battery. 1.7 Individual LCD display the Charging process The grid of battery figures rolling in charge status indicates the battery is CHARGING correspondingly. If the battery has been charged for 50% nominal capacity, the first grid will stop rolling; If been charged for 75% nominal capacity, the second grid will also stop rolling; and If been fully charged , the third grid will stop rolling and display full power and end charging. If you need to pre-discharge the battery, switch to discharge status, the LCD will display the battery is in refresh process, after the battery discharge to 1.0V, the charger can automatic switch to charging