1, the battery charging current is related to the battery capacity, generally one-tenth of the battery capacity (error ±0.5 or so), such as the specification of 12V20aH battery, the normal charging current is 1.5A-2.5A;
2, as for how to adjust the battery charger current, there is usually an adjustment knob to give you the choice of gear, as long as you choose the appropriate current output. But now the chargers on the market are very intelligent, can automatically adjust the output current according to the battery situation, so as to minimize the damage to the battery;
3, it is worth mentioning that normally 4- 5 hours can be fully charged (12V20aH), it is best not to often use the battery to overcharge. Although the current generated by the charger is not very large, because the electrolyte is in a boiling state for a long time, not only the fine particles on the surface of the active substance are easy to fall off, but also the oxidation of the grid frame, resulting in the loose stripping of the active substance and the grid frame, so we must play a lot of spirit when charging.
The car charging road is mostly composed of 34063 step-down circuit, changing the voltage of the sampling point of the fifth pin can change the output voltage of the car is a voltage regulator circuit, the output voltage in the nominal range will not change with the change of the input voltage, otherwise it is not called the voltage regulator power supply 34063 working voltage range is very wide, if the circuit voltage drop is ignored, As long as the input voltage is higher than 5V, it can work normally, and the circuit can stabilize the output voltage of 5V when it is about 1V higher than 5V