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The battery capacity is divided by the charging current, multiplied by a coefficient of 1.2, and the time unit is in hours.

Explanation: Generally, the capacity of a battery is indicated on the battery, in milliamperes. The larger the value, the greater the capacity. For example, 1200mAh means that the capacity of the battery is 1200mAh. Meanwhile, chargers are generally labeled with charging current, also measured in milliamperes.

For example, if the battery capacity is 1200mA and the charging current of the charger is 600mA, the charging time is (1200mA/600mA) x 1.2=2.4 hours, then the charging time for this battery using this charger is 2.4 hours.

Note: The above calculation method is not applicable to new batteries.

The charging time of a battery can be calculated using the formula: battery capacity/charging current * 60. For example, if the battery is 2500mA and the charging current is 500mA, then 2500/500 * 60=300 minutes can be calculated. In fact, this is only a theoretical time, and it may take longer to charge because this type of charger is not a constant current charger. That is to say, as the charging time increases, the charging current will relatively decrease. Generally speaking, there should be no problem with charging for 8 hours. When charging, you can touch the surface of the battery with your hand. There will be slight heating, which indicates that the battery is charging well. The highest charging voltage of a 1.2V nickel hydrogen battery is around 1.4V, and a multimeter can be used to measure whether it is fully charged. Additionally, this type of charger takes the same amount of time to charge one and multiple batteries, as its outputs are independent of each other. Take a look at the output of 1.2V-500mA * 4AA500mA * 2AAA, which indicates that this charger has four independent outputs of 500mA.

The voltage of the charger is 5V and the charging current is 500MA. It takes me 1 hour and 20 minutes to fully charge it.

Due to the fact that lithium battery charging control is divided into two stages,

The first stage is constant current charging, and when the battery voltage is below 4.2V, the charger will charge at a constant current.

The second stage is the constant voltage charging stage. When the battery voltage reaches 4.2V, due to the characteristics of lithium batteries, if the voltage is too high, it will be damaged. The charger will fix the voltage at 4.2V, and the charging current will gradually decrease. When the current decreases to a certain value (usually 1/10 of the set current), the charging circuit will be cut off, and the charging is completed.

Therefore, according to your description, if your 500mA has been tested with an ammeter, your capacity is estimated to be 600mAh (which will be smaller than 500 * 1.33 because the second constant voltage stage accounts for about 20% of the charging time, and the actual charging current during this process will be smaller). If 500mA is the marked value on the charger. Perhaps the actual current is not yet as high.

If precise, please connect a multimeter in series to the output of the charger and record the current every 5-10 minutes (note that it is in the off state). Add up the amount of electricity charged during each period to determine the capacity.

Understanding the charging time of lithium batteries, in terms of difficulty, is not a big operational problem. Clarifying the sources of lithium battery charging time is more helpful in making it more scientific in theory and practice.

The theoretical charging time for lithium batteries is the ratio of the nominal capacity of the battery to the current:

Lithium battery charging time (h)=battery capacity (mAh) ÷ charging current (mA)

However, due to the generation of impedance during charging, in order to offset the influence of impedance, the actual charging time should be greater than the theoretical charging time mentioned above. In order to ensure that the charging time of lithium batteries meets the actual full charge requirements, a coefficient greater than 1 is generally set based on the ratio of charging current to battery capacity. For example,

When the charging current is less than or equal to 5% of the battery capacity, the coefficient is 1.6

Lithium battery charging time=battery capacity ÷ charging current x 1.6

Similarly, based on the proportion of charging current to battery capacity, the coefficient for calculating the charging time of lithium batteries is also

1.5 (5%<charging current ≤ 10%),

1.3 (10%<charging current ≤ 15%),

1.2 (15%<charging current ≤ 20%),

1.1 (20%<charging current).

In practice, the charging time of lithium batteries in portable electronic products is also designed according to the above formula. These lithium batteries are generally equipped with corresponding constant current chargers. This type of lithium battery charger controls the charging time of the lithium battery by using a full charge indicator light. When the battery is fully charged, it will emit an alarm signal. Therefore, consumers only need to follow the instructions and do not have to worry about how long the charging time of the lithium battery is appropriate.

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