42V 4A Li-ion Battery Charger – 5.5x2.1mm Connector for Electric Bikes and Scooters

This 42V 4A charger is designed to charge 36V (10S) lithium-ion batteries used in many electric bikes, electric scooters, and electric mopeds.

It delivers a stabilized output voltage of 42 V and a charging current of 4 A, enabling fast charging while protecting the battery through several built-in safety systems.

The charger is equipped with a 5.5 × 2.1 mm DC connector with a retaining ring, ensuring a reliable and stable connection during charging.

Thanks to its universal 100–240 V power supply, it can be used on most household electrical systems.

⚠️ This charger is intended solely for 36 V lithium-ion batteries.
Do not use with LiFePO4 or lead-acid batteries.

Technical Specifications

Product type: lithium battery charger
Compatible battery technology: Li-ion 36V (10S)

Input voltage: 100–240 V AC
; Frequency: 50/60 Hz

Output voltage: 42V DC
; Output current: 4A

Connector: 5.5 x 2.1 mm DC jack
Power plug type: EU plug

Operating temperature: -10°C to 50°C
; Humidity: 20 to 90% RH

Standards: CE / RoHS

LED indicator

Red: battery charging
Green: charging complete

Built-in Protections

Overvoltage Protection (OVP)
Overcurrent Protection (OCP)
Overload Protection
Short-Circuit Protection

These safety features help protect the battery throughout the entire charging process.

Instructions for Use

1. Connect the charger to the battery

2. Next, plug the charger into an outlet

3. When the LED turns green, charging is complete

4. First, unplug the charger from the wall outlet, then remove the battery

For optimal charging, you can leave the charger plugged in for 1 to 2 hours after the indicator turns green.

To preserve battery life, it is recommended that you charge the device at least once every 3 months.

Compatibilities

This charger is compatible with any device equipped with:

• a 36V lithium-ion battery

• a 5.5 × 2.1 mm DC connector

Common applications:

• 36V electric bikes

• 36V electric scooters

• 36V electric scooters

• DIY 36V lithium batteries

• portable electrical equipment

Warranty: 1 year