XH-M602 Battery Charging Control Module – Digital Automatic Charger Cut-Off

The XH-M602 Battery Charging Control Module is a digital battery voltage monitoring and automatic charger control board designed for rechargeable battery charging automation. Featuring a three-digit LED voltage display, adjustable charging start and stop thresholds, and an onboard electromechanical relay, this module provides an effective way to automatically control an external battery charger according to the connected battery’s voltage.

The XH-M602 is commonly specified for battery voltage monitoring between 3.7V and 120V DC, depending on the hardware version. It uses a 220V AC operating input and separate battery voltage detection terminals. The module is particularly useful for electronics projects, battery charging systems, backup battery installations, and workshop applications where automatic charger switching is required.

Unlike a standalone battery charger, the XH-M602 does not produce a regulated DC charging output. Instead, it monitors the battery voltage and switches the AC supply to a separate compatible battery charger. This distinction is important when selecting the module for lithium-ion and other rechargeable battery systems.

Digital Battery Voltage Monitoring

The XH-M602 features a three-digit seven-segment LED display that provides convenient real-time battery voltage monitoring. The display is commonly specified with a 0.1V resolution, allowing users to observe battery voltage changes during charging and maintenance.

The digital display makes it easier to monitor battery conditions and configure suitable voltage thresholds without continuously connecting a separate voltmeter.

This feature is useful in battery charging projects, electronics workshops, backup power systems, and automatic charging installations.

Adjustable Charging Start and Stop Voltage

One of the most useful features of the XH-M602 Battery Charging Control Board is its adjustable charging start and stop voltage control.

The module includes two push buttons that allow users to configure the voltage thresholds for automatic charger switching.

Start Charging Voltage: This is the lower voltage threshold. When the battery voltage falls to the configured restart level, the module activates its relay and allows the external charger to receive AC power.

Stop Charging Voltage: This is the upper voltage threshold. When the battery voltage reaches the configured cut-off level, the module disconnects the external charger’s AC supply.

The difference between the start and stop thresholds creates a control band that helps reduce unnecessary switching around a single voltage level.

The correct thresholds depend on the battery chemistry, cell configuration, charging specifications, and external charger characteristics. Always follow the battery manufacturer’s recommended charging limits.

Automatic Battery Charger Cut-Off

The XH-M602 uses an onboard relay to automatically control the external charger’s power supply.

When the battery reaches the selected upper voltage threshold, the relay disconnects the charger from its AC supply. When the battery voltage subsequently drops to the configured lower threshold, the module reconnects the charger.

This automatic operation helps reduce the need for manual switching and provides convenient voltage-based charging control.

The relay fitted to the illustrated module is marked 10A 250VAC / 10A 30VDC. These ratings apply under specified operating conditions. The suitability of the relay depends on the actual charger load, inrush current, wiring, protective devices, and switching requirements.

220V AC Input and External Charger Connection

The XH-M602 includes a four-position AC screw terminal block and a separate two-position battery voltage detection terminal.

The AC terminal block is used for connecting the module’s operating supply and the switched AC output to the external battery charger.

The green terminal block, marked +VIN and -VIN, is used to monitor the battery voltage.

The external charger supplies the required charging voltage and current to the battery. The XH-M602 only controls when that charger receives AC power.

This design allows the module to be used with a suitable existing charger without replacing the charger’s own voltage and current regulation system.

Compatible Battery Applications

The XH-M602 is commonly advertised for voltage-based charger control applications involving lithium-ion and other rechargeable battery systems.

However, a battery’s voltage alone does not determine whether a charging system is compatible.

The external charger must provide the correct charging voltage and current for the battery chemistry, cell count, and manufacturer specifications.

For lithium battery packs, a suitable Battery Management System (BMS) should provide the necessary cell-level protection, balancing, and other safety functions appropriate to the battery design.

The XH-M602 monitors the overall battery voltage. It does not individually monitor battery cells, balance cells, or replace a dedicated BMS.

Compact PCB Design

The module is constructed on a blue printed circuit board featuring a transformer, electromechanical relay, three-digit LED display, two control buttons, red indicator LED, screw terminals, capacitors, and control electronics.

Its compact design includes four mounting holes for installation inside a suitable protective enclosure.

Commonly published PCB dimensions are approximately 86 × 58 × 24 mm, while the supplied product dimension image shows a board footprint of approximately 86.1 × 58.8 mm. Actual measurements should be confirmed for the supplied hardware version.

Because the module operates with hazardous AC mains voltage, it should be installed in an appropriately insulated enclosure with suitable wiring and protective devices.

Product Highlights

• Automatic Charger Cut-Off: Switches an external battery charger according to preset voltage thresholds.
• Digital Voltage Monitoring: Displays connected battery voltage in real time.
• Wide Voltage Detection Range: Commonly specified for 3.7V–120V DC battery monitoring.
• 220V AC Operating Input: Designed for mains-powered charger control applications.
• Adjustable Start Voltage: Set the battery voltage at which charging should restart.
• Adjustable Stop Voltage: Set the battery voltage at which charging should stop.
• Digital LED Display: Three-digit display with commonly specified 0.1V resolution.
• Onboard Relay: Provides automatic external charger switching.
• Dual Control Buttons: Convenient adjustment of charging thresholds.
• Battery Detection Terminals: Dedicated +VIN and -VIN connections.
• Compact PCB: Four mounting holes for installation.
• External Charger Control: Works with a separate compatible battery charger.
• DIY Applications: Suitable for battery charging automation and electronics projects.
• Lithium Battery Systems: Requires a suitable charger and appropriate BMS protection.

Technical Specifications

Specification	Details
Product Model	XH-M602
PCB Marking	HW-631 (illustrated variant)
Product Type	Digital Battery Charging Control Module
AC Operating Input	220V AC
Battery Voltage Detection Range	3.7V–120V DC (published range; verify hardware revision)
Display Type	Three-Digit LED
Display Resolution	0.1V
Published Control Precision	0.1V
Published Voltage Tolerance	±0.1V
Control Method	Adjustable Start/Stop Voltage
Switching Type	Electromechanical Relay
Relay Contact Marking	10A 250VAC / 10A 30VDC
Battery Detection Connection	+VIN / -VIN
AC Connections	AC Input and Switched Charger Output
Control Buttons	2 Push Buttons
PCB Color	Blue
Mounting Holes	4
Approximate PCB Dimensions	86 × 58 × 24 mm
External Battery Charger	Required
Lithium Battery BMS	Required where applicable

Note: Technical specifications may vary between manufacturing batches and hardware revisions. Verify the supplied module’s actual operating range, terminal markings, dimensions, and relay ratings before installation.

Applications

The XH-M602 Battery Charging Control Module is suitable for compatible applications such as:

• Automatic Battery Charging Control: Automatically switching an external charger based on battery voltage.
• Lithium Battery Charging Systems: Voltage-based charger control when used with an appropriate charger and BMS.
• Backup Battery Systems: Managing the operation of a compatible external battery charger.
• DIY Electronics Projects: Building automatic voltage-monitoring and charger-switching systems.
• Workshop Charging Setups: Controlling suitable external battery chargers.
• Battery Voltage Monitoring: Observing overall battery voltage through the onboard digital display.
• Solar-Related Backup Systems: Controlling a separate compatible AC charger in a backup battery installation.

The module is not a solar MPPT controller and does not replace a dedicated solar charge controller.

What’s in the Box?

• 1 × XH-M602 Digital Battery Charging Control Module

Package Note: Battery, external charger, AC switch, connecting wires, and installation accessories are not included unless specifically stated in the product package.

Important Safety Instructions

The XH-M602 operates using 220V AC mains voltage, which can cause electric shock, fire, or serious injury if improperly connected.

Installation should be performed by a qualified person using appropriately rated wiring, insulation, fuses or circuit protection, and a suitable enclosure.

Never connect the battery directly to the module’s AC input or switched AC output terminals.

Do not exceed the relay’s applicable switching rating or use the module as the only safety protection for a lithium battery.

The voltage detection range does not mean that every battery chemistry or configuration can be safely charged using this module.

Always use a compatible external charger and the battery protection equipment recommended by the battery manufacturer.

External Technical Reference

For additional information about the XH-M602 module, including its operating principle, voltage threshold settings, and connection guidance, consult the following external reference:

XH-M602 Battery Charging Control Module User Manual

This guide is provided for general technical reference. Confirm all connections against the markings and specifications of the actual module before use.

Why Choose Electrica?

Electrica supplies electronic components, development boards, control modules, sensors, testing tools, and DIY electronics accessories for engineers, technicians, students, and electronics enthusiasts throughout Pakistan.

The XH-M602 Battery Charging Control Module is a practical option for customers who want to automate the operation of a compatible external battery charger using adjustable voltage thresholds.

Explore more electronics components and battery charging accessories at:

https://www.electrica.com.pk

For product availability, ordering information, and technical inquiries, contact Electrica through our website or WhatsApp Business channel.