1. Introduction
The XTAR VX2 Pro is a professional-grade, dual-slot smart charger designed for independent control of each battery slot. It is compatible with a wide range of battery chemistries and sizes, including 3.6/3.7V Li-ion, 1.5V Li-ion, 1.2V Ni-MH, and 3.2V LiFePO4 batteries. Featuring a Type-C input, it supports PD, QC, and standard 5V input protocols. The charger integrates multiple functions such as charging, discharging, deep refreshing, capacity grading, and storage, offering a comprehensive battery management experience.
For optimal performance, it is recommended to use an adapter that supports the PD 12V 1.67A protocol.
Video: XTAR VX2 Pro Smart Battery Charger & Tester overview, demonstrating features like dual-slot operation, adjustable current, and various battery types.
2. Package Contents
The standard kit includes:
- VX2 Pro Charger
- User Manual (PDF available for download: User Manual PDF)
- C-C Charging Cable
- Drawstring Bag
Some versions may also include a PD20W Adapter.
3. Setup
3.1 Connecting Power
Connect the VX2 Pro charger to a power source using the provided C-C charging cable. The charger supports multiple input protocols:
- PD 3.0 / QC 3.0: Recommended for fast charging.
- 5V DC: For limited power or emergency use only.
The display will illuminate upon successful connection.
3.2 Inserting Batteries
The VX2 Pro features two independent slots. Gently insert compatible batteries into the slots, ensuring correct polarity (+/-). The charger will automatically detect the battery type and initiate the appropriate process.
3.3 Initial Display
Upon inserting a battery, the charger's HTN LCD display panel will show information such as working mode, battery voltage, real-time current, battery capacity, battery energy, internal resistance (IR), battery type, and selectable current level.
4. Operating Instructions
4.1 Button Functions
- C/V Button:
- Short Press: Switches charging current level (when applicable).
- Long Press: Switches between Standard Mode and LiFePO4 Mode.
- MODE Button:
- Short Press: Switches between slots (Slot 1 / Slot 2).
- Long Press: Switches between functions (CHG, DisCHG, Refresh, Grad, Store).
4.2 Mode Selection
Before inserting batteries, it is recommended to select the appropriate mode. The charger defaults to Standard Mode.
- Standard Mode: For 3.6/3.7V Li-ion, 1.5V Li-ion, and 1.2V Ni-MH batteries.
- LiFePO4 Mode: For 3.2V LiFePO4 batteries. (1.5V Li-ion and 1.2V Ni-MH are automatically recognized in LiFePO4 Mode as well).
Note: Selected mode and function settings are saved after power-off. The current level setting is not saved.
4.3 Functions Overview
The VX2 Pro offers up to 5 intelligent functions:
- CHG (Charge): Standard charging function. For Li-ion batteries, it uses a 3-stage charging method (TC/CC/CV). For Ni-MH, it uses unique CVSA Tech for accurate full-charge detection and lower battery temperature.
- DisCHG (Discharge): Discharges a battery to a cutoff voltage for quick capacity checking and optimal maintenance. The process starts at 300mA constant current.
- Refresh (Ni-MH Only): Performs multiple discharge-charge cycles to revive old Ni-MH batteries and restore their maximum possible capacity. This function is suitable for older or frequently used batteries.
- Grad (Capacity Grading): Executes a full charge-discharge-charge cycle to measure the true capacity of a battery. This is useful for verifying manufacturer claims, spotting aging or degraded batteries, and matching cells for multi-battery setups.
- Store (Storage Mode): Automatically charges or discharges the battery to its optimal storage voltage (1.50V for 1.5V Li-ion, 3.60V for 3.6/3.7V Li-ion) to reduce self-discharge, slow aging, and extend battery life.
4.4 Adjustable Charging Current
The charger allows for manual adjustment of the charging current for 3.6/3.7V Li-ion and LiFePO4 batteries. Options include 0.25A, 0.5A, 1A, 2A, and 3A. The charging current for 1.5V Li-ion and 1.2V Ni-MH batteries is fixed at 0.5A.
Smart Current Selection: The charger automatically detects battery types and internal resistance to match the optimal charging current. This is the recommended method.
Manual Current Selection: To shorten charging time (with a sufficient power adapter), you can manually select a higher current. However, this may affect battery lifespan and increase temperature.
Note: When using a rated adapter, the maximum manual current is 3A for a single slot and 2A per slot for dual-slot charging.
5. Maintenance
5.1 Battery Storage
The Storage Mode function helps maintain batteries at their optimal voltage for long-term storage. This reduces self-discharge and aging, extending battery life. Use this function when batteries are stored for extended periods or shipped over long distances.
Note: Remove the battery promptly after the storage process completes.
5.2 Ni-MH Refresh
The Refresh function is specifically designed for Ni-MH batteries to combat the memory effect and restore their maximum possible capacity. The charger intelligently adjusts discharge-charge cycles based on the battery's condition (up to 4 cycles).
5.3 Low Voltage Activation (0V Activation)
The VX2 Pro features a micro-current activation function to safely and effectively revive over-discharged batteries. If a battery is too low, the charger will attempt to activate it before regular charging begins.
