The battery capacity is divided by the charging current, then multiplied by a factor of 1.2, and the unit of time is hours.
Note: Typically, the battery capacity is listed on the battery in milliamps. The higher the value, the greater the capacity. For example: 1200 mAh means the battery capacity is 1200 mAh. At the same time, chargers are usually marked with the charging current, also in milliamps.
For example: battery capacity is 1200 mA, charger charging current is 600 mA, charging time is (1200 mA/600 mA) × 1.2 = 2.4 hours, then this battery uses this charger charging time is 2.4 hours.
Note: The calculation method above does not apply to new batteries.
Battery charging time can be calculated using the formula: battery capacity/charging current*60. For example, the battery isof 2500 mA and the charging current is 500 mA, then 2500/500*60 = 300 minutes. calculated. In fact, this is only a theoretical time and charging may take longer, because this charger does not charge at constant current. That is, as the charging time becomes longer, the charging current will decrease relatively.
Generally speaking, there will be no problem after 8 hours of charging. When charging, you can touch the surface of the battery with your hand. There will be a slight warmth, which means the battery is well charged. The highest charging voltage of a 1.2V nickel-metal hydride battery is around 1.4V. You can use a multimeter to check if it is fully charged. This charger takes the same time to charge one battery as it does to charge multiple batteries because its outputs are independent of each other. Take a look at the 1.2V-500mA*4AA 500mA*2AAA output, which shows that this chargerhas four independent 500 mA outputs.