this charger just do one charging voltage.
the charger can't working on lead acid batteries

Specifications

90W ABS 36V LiFePO4/Lithium Ion Ebike kit socket golf cart battery Charger

Input Voltage: 100-240V

Output Voltage: 43.8V (for 12 series LiFePO4 battery use)

Output Voltage: 42V (for 10 series Lithium lon battery use)

Output Current: 2A

Charging Mode: CC-CV

Intelligent Charger

Super Powerful Charger 2A

Size:

Weight: 0.65g

Features:

1. Advanced high frequency switching mode power supply technology

2. DC output isolated from AC input

3. Single input 110V AC and 220V AC 50-60Hz

4. Charging parameters are insensitive to the AC input line voltage variations

5. Completely automatic battery charging: CC, CV

6. 2 LEDs: LED 1 Red (power on), LED2 Red/Green (Charging/Full)

7. Short circuit, over voltage, over-temperature, reverse polarity protections

8. Efficiency > 85%

9. 100% full load burn-in test.

Operations:

1. Check if your local main supply confirms to charger's input voltage 110 or 220V. Please set to your correct local compatible vlotage.
110V is compatible for 100-120V countries, 220V is compatible for 220-240V countries. This is very important to avoid charger damage.

2. Connect the charging plug or the DC output cord to battery terminals.

     LED 2 RED confirms charger is charging, LED 2 GREEN confirms battery fully charged

     (N: Positive + ;  L: Negative - ;  Brown: +ve terminal;  Blue: -ve terminal)

3. Connect charger to terminate power supply socket

     LED 1 RED confirms AC power on

Note: If this charger with a Relay for Reverse Polarity Protection, it doesn't have output voltage and current when charger AC
power on but disconnecting with the battery. It will have voltage and current output when it connects with battery. If the charger
has a Fuse instead of Relay for Reverse Polarity Protection, it has output once AC power on.

Charging Stage:

Stage 1: Fast Charge,  Stage 2: Constant Charge,  Stage 3: Slender