48V Lithium Battery Charging Time Chart

Note: Actual charging time may vary slightly due to temperature and BMS balancing.

Quick Answer: The time it takes to charge a 48V lithium-ion battery depends on the battery's capacity (Ah) and the charger's output current (Amps). Generally, it takes between 2 to 5 hours to fully charge a standard 48V battery. For example, charging a 48V 100Ah battery with a 20A charger takes approximately 5 hours (100Ah / 20A = 5h). Using a faster 50A charger can reduce this time to about 2 hours. Below, we provide a detailed calculation formula and a reference chart for different battery sizes.

48v lithium-ion battery

So how to properly charge a 48v lithium-ion battery? 

Power lithium-ion battery charging is divided into two stages:

1. Constant current charging, that is, the current is constant, and the voltage of the lithium-ion battery gradually increases with the charging process. According to the above specifications, it is generally charged at a current of 0.2C (C is a way of expressing the comparison between the nominal capacity of the battery and the current, 0.2 C is 200mA) when the battery voltage is close to the voltage of 4.2V, change the constant current charging to the regular voltage charging. This process is about five hours.

2. Constant voltage charging, that is, the voltage is constant, and the current gradually decreases as the saturation of the cell deepens. According to the specification, when the current drops to 0.01C, the charging is considered terminated. After this process and the constant current charging time are added, the total charging time should not exceed eight hours. Therefore, there are two criteria for judging whether the charging of the lithium-ion battery has reached full saturation: one is that the current is 0.01C. The other is that the total duration does not exceed eight hours. In other words, if the charging process of the lithium-ion battery still cannot reach 0.01 after eight hours C, it is regarded as a non-conforming product. So far, we have a theoretical understanding of charging a lithium-ion battery. When assessing a lithium-ion battery, we only need to set it according to the method on the regular charger manual because the standard lithium-ion battery charger is based on The characteristics of the lithium-ion battery are designed for the charging mode, which includes the process of constant current and constant voltage charging. We only need to judge whether the battery is fully charged according to the charger's indicator light.