XTAR VX2 Pro Smart Battery Charger & Tester User Manual

1. Introduction

The XTAR VX2 Pro is a professional-grade dual-channel independent control smart charger and tester. It is compatible with a wide range of battery types including 3.6/3.7V Li-ion, 1.5V Li-ion, 1.2V Ni-MH, and LiFePO4 batteries. Featuring a Type-C input that supports PD, QC, and 5V protocols, the VX2 Pro integrates multiple functions such as charging, discharging, deep refresh, capacity measurement, and storage, offering a professional battery management experience.

2. Key Features

• Dual-Slot Independent Control: Each slot operates completely isolated, allowing simultaneous different functions (e.g., capacity testing in one slot while discharging in the other).
• Fast Charging: Supports up to 3A Type-C input with adjustable charging current (3A/2A/1A/0.5A/0.25A).
• Wide Compatibility: Supports 1.5V Li-ion, 3.6/3.7V Li-ion, 3.2V LiFePO4, 1.2V Ni-MH, and other battery types.
• Smart Charging: Automatically recognizes battery type and adjusts charging current for safe and fast charging.
• Capacity Test: Accurately detects battery capacity, eliminating false ratings (compatible with all supported batteries).
• NiMH Deep Repair: Eliminates memory effect in NiMH batteries and restores maximum capacity.
• Discharge Mode: Independent discharge function for quickly detecting battery capacity.
• Storage Mode: First-ever support for 1.5V battery storage charging, reducing self-discharge, delaying aging, and extending battery life.
• Internal Resistance Detection: Easily assess battery internal resistance and evaluate battery health.
• 0V Activation: Revives over-discharged batteries for use.
• Clear Display: Large HTN screen for easy viewing of battery status with simple operation.
• Multiple Protections: Built-in protections against overcharge, overcurrent, overvoltage, and soft start, ensuring safer charging.
• Power-Out Memory: Keeps mode and function settings after power interruption until changed.

Image 1: Overview of XTAR VX2 Pro's highlighted features including independent slots, battery types, sizes, precision detection, and various functions.

3. Specifications

Image 2: Detailed specifications for the XTAR VX2 Pro charger.

Image 3: Diagram illustrating the wide range of supported battery sizes, from 10440 to 32650.

4. Safety Information

⚠️ Please mind potential fire risk and strictly follow the instruction manual for charging and storage.

• For the best charging experience, it is recommended to use an adapter with the 12V 1.67A PD protocol. When the power supply is insufficient, the charger will adjust the charging current accordingly.
• Do not charge non-rechargeable batteries.
• Charging is prohibited if the battery is leaking, swollen, has a damaged outer shell, appears discolored, or is deformed in any way.
• Do not insert conductive materials or metal objects into the charger to prevent short circuits.
• Avoid using the charger in direct sunlight, humid (rainy), or heavily dusty environments.
• Do not disassemble or modify the charger, and do not continue to use it if it is damaged.
• Minors must use the charger under adult supervision.
• Please remove the battery promptly after it's fully charged.
• When not in use, remove the battery and unplug the charging cable. Store them in a cool, dry place, and shield them from dust, rain, and direct sunlight to maintain optimal performance.
• If a 3.2V LiFePO4 battery is charged in standard charging mode, it will be recognized as a 3.6V lithium battery, leading to overcharging and battery damage.
• If a 3.6V Li-ion battery is charged in LiFePO4 charging mode, it will be recognized as a 3.2V LiFePO4 battery, leading to incomplete charging.
• In case of recovery failure or any abnormality, the LCD screen will display "Err". At this point, please promptly remove the battery.

Image 4: Visual representation of the multiple safety protections integrated into the VX2 Pro charger, including intelligent detection, precise stop charging, overcharge, overcurrent, short-circuit, overvoltage, reverse connection, and soft-start function.

5. Setup

1. Power On: Connect the charger to a power source using the provided USB-C cable and a recommended PD2.0 (12V 1.67A) adapter.
2. Insert Battery: Carefully insert the battery into an available slot, ensuring correct polarity.
3. Select Mode:
   
   • The charger defaults to Standard Mode, suitable for 3.6/3.7V Li-ion, 1.5V Li-ion, and 1.2V Ni-MH batteries.
   • For 3.2V LiFePO4 batteries, Long Press the C/V button to switch to LiFePO4 Mode. (1.5V Li-ion and Ni-MH batteries are also automatically recognized in LiFePO4 Mode).

   Note: The selected mode and function are saved after power-off; the current level is not.

Image 5: Front view of the XTAR VX2 Pro charger, showing the display and battery slots.

Image 6: Illustration of the USB-C input supporting fast charging with a PD 20W adapter.

6. Operating Modes & Functions

The VX2 Pro offers multiple functions for comprehensive battery management. To switch between functions (CHG, DisCHG, Refresh, Grad, Store), Long Press the MODE button. To switch between slots, Click the MODE button.

6.1. CHG (Charge) Mode

The charger intelligently detects battery types and auto-matches the optimal charging method, then auto-adjusts the best charging current based on adapter power and battery status.

• Smart Current Selection: After inserting the battery, the charger automatically detects and applies the optimal charging current level for 3.6/3.7V Li-ion and LiFePO4 batteries based on internal resistance. The selected level is the safe upper limit, and the real-time current adjusts dynamically during charging.
• Manual Current Selection: To speed up charging (with a sufficient power adapter), you may manually select 0.25A, 0.5A, 1A, 2A, or 3A by Clicking the C/V button. This may reduce battery lifespan and raise temperature; smart current selection is recommended.

Note: 1.5V Li-ion and 1.2V Ni-MH batteries charge at a fixed 0.5A (non-adjustable). Max manual current: 3A for single-slot, 2A per slot for dual-slot charging (with rated adapter). Manual mode locks after adjustment. To restore smart mode, unplug and reconnect the adapter.

Image 7: Diagram showing the charging process: Power cord connection, battery diagnosis in progress, and charging complete with 'Full' displayed.

Image 8: Explanation of Li-ion 3-stage charging (TC/CC/CV) and Ni-MH CVSA Tech for safe and efficient charging.

Image 9: Display showing options for selectable current levels: 0.25A, 0.5A, 1A, 2A, 3A.

6.2. DisCHG (Discharge) Mode

Discharges a battery to a cutoff voltage for quick capacity checking and optimal maintenance. After battery detection, discharging begins at a constant 300mA while tracking capacity and energy. "donE" is displayed upon completion.

Note: Discharge auto stops when complete. Switch to CHG mode manually to prevent over-discharge.

Image 10: Graph illustrating the quick discharge process for battery checks, showing voltage and current curves.

6.3. Refresh (Ni-MH Only) Mode

For Ni-MH batteries, the charger runs multiple discharge-charge cycles until the process is complete, displaying "donE". This function helps revive old batteries and restore effective capacity by eliminating the memory effect.

Note: The number of discharge-charge cycles varies by battery condition, with a maximum of 4 cycles. This function is only for 1.2V Ni-MH; other types will charge until full.

Image 11: Visual guide for the Refresh function, showing battery refresh in progress and completed states.

6.4. Grad. (Capacity Grading) Mode

After battery detection, the charger performs a full charge-discharge-charge cycle. "donE" appears when grading is complete. This function measures actual battery capacity, useful for identifying aging or overstated cells.

Note: Capacity is only shown during discharge, not charge. Voltage is not displayed during 1.5V Li-ion capacity grading.

Image 12: Illustration of the Capacity Grad function, showing the process in progress and completed, ideal for verifying manufacturer claims and spotting degraded batteries.

6.5. Store (Storage) Mode

The VX2 Pro is the first charger to support a storage function for 1.5V Li-ion batteries. After battery detection, the charger automatically charges or discharges it to the optimal storage voltage. "donE" appears when the process is complete. This helps prolong battery shelf life by reducing self-discharge and slowing aging.

Note: Remove the battery promptly after the process completes. Use this function when batteries are stored for extended periods or shipped over long distances.

Image 13: Visual of the VX2 Pro's Storage Mode, showing batteries being prepared for long-term storage.

7. Display Indications

The large HTN LCD display panel provides clear information about the battery status and charging process.

• Charging: Battery level bars flash upward.
• Discharging: Battery level bars flash downward.
• Discharge complete: No battery level bars.
• Storage complete: 2 battery level bars remain solid.
• Full charge/refresh complete/capacity grading complete: 4 battery level bars remain solid.
• Identifying/activating: Battery type icon flashing.
• Charging: Battery type icon solid.
• Error: LCD displays "Err".
• Power-Saving Mode: Backlight dims to 10% after 1 minute of inactivity in any mode or function screen.

Image 14: Labeled diagram of the VX2 Pro's full-view display panel, indicating working mode, battery voltage, real-time current, fast charging, battery capacity, energy, IR, battery type, and selectable current level.

8. Troubleshooting

• "Err" Displayed: If the LCD screen displays "Err" during operation (e.g., during battery recovery), it indicates a failure or abnormality. Promptly remove the battery.
• Incomplete Charging: Ensure the correct battery mode (Standard or LiFePO4) is selected. Charging a 3.6V Li-ion battery in LiFePO4 mode will result in incomplete charging.
• Overcharging: Charging a 3.2V LiFePO4 battery in Standard mode will lead to overcharging and potential battery damage.
• Manual Current Lock: If you manually adjust the charging current, the charger will remain in manual mode. To revert to smart mode, disconnect and reconnect the adapter.
• Tight Cable Connection: If the charger does not power on, check that the USB-C cable is firmly inserted into both the unit and the power supply.

9. User Tips

• For optimal performance, use a PD12V protocol adapter.
• The discharge function operates at 300mA, which may be slow for some users. Plan accordingly for capacity checks.
• The VX2 Pro is noted to be larger in real life than it appears in pictures. Consider its dimensions if portability is a primary concern.
• The capacity test is a highly valued feature for verifying battery health and specifications.
• The charger works effectively with 18650 Li-ion cells.

10. Warranty & Support

To receive after-sales service for the product, please provide the Warranty Number and an invoice (or receipt).

• 15-day free exchange.
• 24-month free repair: This product includes a 24-month free repair service, starting from the day of purchase. For repairs outside of the warranty period, you will need to pay the costs of materials and shipping.
• Lifetime technical support.

Note: Malfunctions due to improper use or storage, or failure to observe these operating instructions, will not be covered by XTAR.

If you have any after-sales questions, please contact XTAR official Customer Support at service@xtar.cc.

For more information, please visit www.xtar.cc.

11. Authenticity Check

To verify the authenticity of your XTAR VX2 Pro charger:

1. Gently scratch to reveal the 18-digit serial number on the back of the product or its packaging.
2. Go to www.xtar.cc and enter the serial number to authenticate (navigate to Contact Us - Anti-Fake).

12. Package Contents

The standard kit includes:

• User Manual
• VX2 Pro Charger
• C-C Charging Cable
• Drawstring Bag

A "Set" version may also include a PD20W Adapter.

Image 15: Contents of the XTAR VX2 Pro Kit, including the charger, manual, cable, and drawstring bag.

Image 16: Comparison of the XTAR VX2 Pro Kit and Set package options, showing the additional PD20W adapter in the Set.