High Power 100A 60a 85A Smart 12v Charger 30A 20A Fast Charging with Adjustable Current 100V-240V for Lifepo4 Lithium Battery

Step1: Do not connect the battery to the charger, turn on the power, adjust the voltage knob to adjust the voltage, refer to the voltage display at the top of the display, (4S lifepo4 battery 3.65 v*4=14.6V, 3S lithium battery 4.2v *3=12.6V), adjust to the voltage you need (you can adjust the voltage in combination with a multimeter. The display will have a small error.).
The usage method of a 40A charger is as follows: First use: Connect the power supply first, adjust the voltage you want, then connect the battery, the charger display screen will turn off, unplug the power plug and plug it in again, it will display normal charging, and adjust the charging current.

Second use (the voltage has been set for the first time, no need to set it again later) — Connect the battery first (it is important to protect the charger) — Then connect the power — Follow the second step for all subsequent uses.
Do not adjust the charger voltage during charging. The voltage of the charger itself fluctuates, and constant voltage charging of the battery is normal. When the battery is fully charged, the current on the charger display screen will be displayed as zero or close to zero. The display screen is a bit inaccurate. If it is an LFIEPO4 battery, it becomes more difficult to charge it later on. The display screen shows 0, and the multimeter may still have weak current charging. This is virtual electricity. This is a normal phenomenon. If you don’t understand, please consult customer service

To extend the lifespan of the charger. Charger 220V voltage, maximum recommended current is 90%, for example 60A, it is most suitable to adjust to around 54A. The maximum recommended voltage and current for 110V is 80%, and the maximum recommended voltage and current for 100V is 70%

Attention: After adjusting the voltage and connecting it to the battery. Do not adjust the voltage during the charging process. The voltage displayed on the display screen is the voltage reached by the battery. After being fully charged, the voltage displayed is 14.6V/12.6V. The battery has a fully charged current of 0A