The image above is a photo of a charger. The device on the panel basically consists of a voltage selection switch (bottom left), a current adjustment knob (middle) and a load ammeter.
First of all, to charge the battery, you need to know the rated voltage and capacity of the battery being charged.
The voltage is already known to be 12 V and the capacity is unknown. You can check the battery label. We assume the battery capacity is 40 Ah.
Adjustment method:
1. Before connecting the battery charging cable, turn the voltage selection switch on the bottom corner of the pack to 12V and turn the current adjustment knob counterclockwise to “OFF.”
2. Turn on the phone after connecting the charging cable. At this time, the charging ammeter displays "0". Slowly turn the knobcurrent adjustment clockwise, and the ammeter pointer starts to deviate to the right until it indicates 4A and stops the adjustment (the charging current value is 0, 1 times the battery capacity).
Note: This charging current value uses 0.1 times the battery capacity, called 0.1C rate charging method. It is currently a globally recognized method. international, although the charging time will be longer (the battery is exhausted). it may need to be recharged for more than 10 hours).
Normally, a 128V lithium battery charger cannot directly charge a 12V lithium battery. The output voltage of the charger must match the rated voltage of the battery, otherwise This could lead to safety issues such as overcharging or over-discharging the battery. If you want to charge a 12V lithium battery, it is recommendedPlease choose a charger with a rated output voltage of 12V to ensure safety and the best charging effect. When using the charger, be sure to read and follow the appropriate instructions and safety precautions.