If you’ve recently purchased an XH-M608 battery spot welding control board, or if you’re struggling to get consistent welds from your DIY 18650 battery pack assembly, you have likely found yourself searching for one specific document: the XH-M608 Manual.
While the device is a popular, cost-effective solution for hobbyists and small-scale EV battery builders, the manufacturer often provides a sparse, poorly translated pamphlet. This article serves as the comprehensive, unofficial manual for the XH-M608. We will cover everything from pinout configurations and wiring diagrams to advanced parameter settings and common error codes.
For additional support, refer to the IC (LM393 or similar comparator) datasheet or contact your module supplier.
is a DC 6–40V battery charge/discharge module that integrates a voltmeter and a relay to automate battery protection and management. It is widely used for DIY energy projects, such as solar charging or protecting lithium and lead-acid batteries from over-discharge. Key Specifications Voltage Range:
Supports DC 6–40V input, suitable for 12V, 24V, and 36V battery systems. Precision: Features a voltage error and control accuracy of plus or minus 0.1 cap V Safety Features:
Includes integrated undervoltage and overvoltage protection to prolong battery life.
Employs a relay output to simplify the control of external chargers or loads. Programming Guide (Menu P0–P4) The module is programmed using three buttons: . To enter the settings, long-press Description Operating Mode Sets the module to (Voltage detection), (Charge mode), (Discharge mode), or (Voltage limit/monitoring). Lower Limit Voltage
Sets the voltage threshold where the relay triggers to start/stop based on the mode. Upper Limit Voltage Sets the maximum voltage threshold.
Sets a charge/discharge timer in minutes (0 means disabled). Calibration
Used to calibrate the onboard voltmeter if it differs from a multimeter. Basic Operation
The XH-M608 is a versatile, all-in-one battery management module designed to handle both charging and discharging. Unlike simpler boards, this one acts as a smart switch that monitors your battery’s voltage in real-time, preventing the two biggest killers of battery life: overcharging and deep discharging.
Here is a practical guide to understanding and setting up your module. 1. Understanding the Hardware
The board features a three-digit LED display, two control buttons (Set, +, and -), and a heavy-duty relay.
Voltage Range: It typically supports DC 6V to 60V, making it compatible with lead-acid batteries and lithium packs (1S to 14S).
Relay Capacity: Most versions are rated for 20A, but for long-term reliability, it’s best to keep your load under 15A. 2. Core Functions: P0 & P1 The module operates based on two primary set points:
P0 (Lower Limit): The voltage at which the relay closes (turns on). Xh-m608 Manual
P1 (Upper Limit): The voltage at which the relay opens (turns off). 3. How to Program the Module
To enter the settings menu, long-press the SET button for about 3 seconds. Use the + and - buttons to toggle between P0 and P1, and press SET again to adjust the values. Scenario A: Battery Charging (The "Automatic Charger" Mode)
In this setup, you connect a power source to the input and your battery to the output.
Goal: Start charging when the battery is low; stop when it's full.
Settings: Set P0 to your "start charging" voltage (e.g., 12.0V for a 12V battery) and P1 to your "full" voltage (e.g., 14.4V).
Logic: When the voltage drops to P0, the relay clicks on. When it hits P1, it cuts the power.
Scenario B: Battery Discharge (The "Low Voltage Cutoff" Mode)
In this setup, you connect your battery to the input and your load (like a motor or lights) to the output.
Goal: Power your device, but cut the power before the battery drains too low.
Settings: Set P0 to your "recovery" voltage (e.g., 12.5V) and P1 to your "cutoff" voltage (e.g., 10.5V).
Logic: The module will provide power until the battery hits P1, then it will disconnect the load to protect the cells. 4. Calibration and Safety
If you notice the display doesn't match your multimeter, most XH-M608 boards allow for voltage calibration. Disconnect power. Hold the SET button while reconnecting power.
Adjust the display value until it matches your known accurate multimeter reading.
Important Tip: Always double-check your polarity. The module does not usually have reverse-polarity protection, and a single misplaced wire can fry the main chip instantly.
Are you planning to use this for a solar setup or a DIY battery charger? If you’ve recently purchased an XH-M608 battery spot
The XH-M608 is a versatile DC 6-40V battery charge and discharge control module designed to protect batteries from overcharging and deep discharging. By utilizing an onboard relay and a precise voltmeter, it acts as a programmable switch that can automate the charging of 6V to 40V batteries or disconnect loads when voltage drops too low. 🛠️ Core Specifications
The XH-M608 is highly adaptable for lead-acid and lithium battery systems: Input Voltage Range: DC 6V to 40V Display Accuracy: 0.1V Control Accuracy: 0.1V Voltage Error: +/- 0.1V Output Type: Relay output (acts as a switch) Dimensions: 66 x 46 x 16 mm 🔌 Wiring Guide
The module features clear screw terminals for power, sensing, and control. Ensure you observe polarity to avoid damaging the unit. 1. Basic Setup
VCC+ / VCC-: Connect your main DC power source (6-40V) to power the module itself.
BAT+ / BAT-: Connect the battery you wish to monitor. This is where the module reads the voltage level.
Relay Terminals (COM, NO, NC): These act as a dry contact switch. COM (Public): The common feed.
NO (Normally Open): Connects to COM when the relay is triggered (e.g., charging is active).
NC (Normally Closed): Connects to COM when the relay is idle. 2. Charging Control (Example)
To automate a charger, route one wire of the charger’s output through the COM and NO terminals. The relay will close and complete the circuit only when the battery needs charging. ⚙️ Programming and Settings
The XH-M608 uses a simple three-button interface: SET, ADD, and DEC. Parameter Menu (P0 - P3) Short press SET to cycle through the main menu options: Description P0 Mode Selection
Choose between U (Undervoltage), P (Overvoltage), C (Charge), or D (Discharge). P1 Lower Limit Sets the voltage floor (e.g., 10.8V for a 12V battery). P2 Upper Limit Sets the voltage ceiling (e.g., 14.4V for charging). P3 Calibration
Adjust the displayed voltage (A.00) to match a professional multimeter. How to Set Thresholds Enter Menu: Press SET until "P1" or "P2" appears.
Adjust Values: Press SET again to see the current voltage value. Use ADD or DEC to change it.
Save: The module saves automatically after a few seconds of inactivity. 💡 Practical Use Cases
Solar Systems: Automatically disconnect lights or small inverters before the battery drains completely. For additional support, refer to the IC (LM393
Automotive: Maintain a backup battery by only allowing charging when the main system is above a certain voltage.
DIY Power Banks: Protect lithium packs from exceeding safe charge/discharge ranges.
🚨 Safety Note: While the relay can handle significant current, always check your specific model's rating (usually 10A or 20A). For high-power loads, use the XH-M608 to trigger a larger external contactor or heavy-duty relay. If you'd like to dive deeper, let me know:
What battery type are you using (e.g., Li-ion, Lead-Acid, LiFePO4)? What is the voltage of your system (12V, 24V, etc.)?
Are you primarily looking to charge or protect from discharge?
Searching for "XH-M608 manual advanced" reveals no official document, but user teardowns have discovered hidden functions.
| Parameter | Typical Value | |--------------------|------------------------------------| | Power supply | DC 12V or 24V (check variant) | | Temperature range | -50°C to +120°C (with NTC thermistor) | | Control accuracy | ±0.1°C or ±0.5°C | | Output relay | 10A / 250V AC (resistive load) | | Sensor type | NTC 10K (B=3435 or 3950) | | Display | 3-digit 7-segment LED (red) | | Dimensions | ~ 79 × 43 × 25 mm |
Users searching for the XH-M608 manual often confuse it with its cousin, the XH-M601.
Verdict: If you are welding 0.1mm nickel strips for a simple battery pack, the M601 is fine. If you are doing 0.2mm pure nickel or copper sandwiches, you need the precision of the XH-M608 manual settings.
Look closely at the board. You’ll see a tiny jumper connecting JD-Vcc to Vcc. The manual eludes to this with a cryptic sentence like, "If use different voltage, take out jumper."
This is where the XH-M608 becomes a magician. Leave the jumper on: the relay coil and the logic circuit share the same 5V power – simple, for beginners.
Remove the jumper: You can now power the relay coils with 5V (or 12V, or 24V!) while your microcontroller uses 3.3V. This is complete isolation. It means your $50 Arduino won’t fry when the water pump kicks in. The manual doesn’t explain why this is glorious – but trust me, it’s the difference between a hobby and a house fire.
Despite the manual, users frequently encounter:
| Issue | Why the manual fails | |------------------------------------|--------------------------------------------------| | Wrong sensor type | Manual says “NTC 10K” but not B-value (3435 vs 3950). | | Relay does not turn off at setpoint | Manual doesn’t explain that cooling vs heating logic inverts hysteresis. | | Display shows “---” or “HHH” | Manual lacks detailed error code list. | | Buttons don’t respond | Manual doesn’t mention entering programming mode (hold Set 3+ sec). | | Power supply confusion | Some units accept DC 12–24V, others only 12V – not specified. |
Recommendation: Users should supplement the manual with online forum posts or a multimeter check.
To avoid frustration, follow this workflow: