1. Select the appropriate resistor: change the current by changing the charging output current limiting resistor of the charger. For large-capacity batteries, it is best to use an ammeter to select the appropriate resistance.
2. Making ammeter: When charging, insert the charger plug into the charging socket of the battery car, turn on the power indicator light to see the current, and if the current is too large, connect a resistor in series to limit the current.
3. Adjust the current: according to the relationship between resistance and current, change the current by changing the resistance. If more current is needed, the resistance value will increase, and if less current is needed, the resistance value will decrease.