Currently, the voltage of lithium batteries is considered the cut-off voltage, which is divided into high and low voltages. 14.8V is the rated voltage, and the actual working voltage is about 13-17V, which is about 14.8V. change;
The charging current is divided into charging slow and fast charging. Generally, slow charging method is used for safe charging, that is, current 0.5C = 0.5 * 4.4 = 2.2A. 2C=2*4.4= 8.8A. The specific requirements are as follows: follow the lithium battery manufacturer's requirements and be especially careful when fast charging.
For reference.
18650 lithium battery, 4 strings, capacity 2600 mAh, if it is 3.6V, 4 strings are 14.4V, if it is 3.7V, 4 strings are 14.8 V.
43.68Wh÷2600mAh=14.8V.
The full voltage is 4 × 4.2 V = 16.8 V.
Use a charger with a limited voltage of 16.8 V and a current520 mA load rating. It can be fully charged in 5 hours and the full voltage is 16.8V.