How long should a battery be charged to be considered fully charged? Many friends are worried that if the time is not enough, the battery power will be insufficient, and the battery life may be shortened; if the time is too long, it may damage the battery. So how long should it be charged? The following is a brief introduction and a simple calculator designed based on the following theory.

The capacity of most batteries is indicated on the battery, in milliamperes. The larger the value, the greater the capacity. For example: 1000mAh means that if the battery is discharged at a current of 1200 milliamperes, it will take about an hour to discharge. At the same time, the charger is generally marked with the charging current, which is also in milliamperes.

In this way, the length of battery charging time can be simply calculated as follows: battery capacity divided by charging current, and then taking into account the loss due to heat and other factors during the charging process, the usual empirical loss range is between 10% and 40%. Therefore, it is often multiplied by a coefficient of 1.2 (or 1.1) or even 1.3, 1.4, and the time unit is hours. The simple calculation formula is:

Charging time (minutes) = battery capacity * 1.2 / current (mA) * 60

The above calculation method is not applicable to new batteries. Generally speaking, the first three times a new battery is charged, especially nickel-cadmium batteries and nickel-metal hydride batteries, the standard charging time is about 15 hours (0.1C), so that the battery can reach the maximum use time. In the future, you can refer to the above method to calculate the battery charging time