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1.5V Li-ion Capacity Tester
Widely Compatible
Highly Accurate
1.5V Li-ion Capacity Tester
Widely Compatible
Highly Accurate
Product Information
All-In-One Battery Compatibility
· 3.6/3.7V Li-ion & 3.2V LiFeP04
10440/14430/14500/14650/16340/17335/17500/
17670/18350/18490/18500/18650/18700/20700/
21700/22650/25500/26650/32650
· 1.5V Li-ion
AAA/AA
· 1.2V Ni-MH
AAA/AA/A/SC/C/D
· 3.6/3.7V Li-ion & 3.2V LiFeP04
10440/14430/14500/14650/16340/
17335/17500/17670/18350/18490/
18500/18650/18700/20700/21700/
22650/25500/26650/32650
· 1.5V Li-ion
AAA/AA
· 1.2V Ni-MH
AAA/AA/A/SC/C/D
Individual Control & Support Mix Charge/Grading
Four charging management methods with independent slots, allowing for simultaneous charging of different types and quantities of batteries.
Standard Mode：
· 1.5V Li-ion
· 3.6/3.7V Li-ion
· 1.2V Ni-MH
LiFePO4 Mode：
· 3.2V LiFePO4
· 1.5V Li-ion
· 1.2V Ni-MH
Standard Mode：
· 1.5V Li-ion
· 3.6/3.7V Li-ion
· 1.2V Ni-MH
LiFePO4 Mode：
· 3.2V LiFePO4
· 1.5V Li-ion
· 1.2V Ni-MH
* Doesn’t support simultaneous charging of 3.6V/3.7V Li-ion and 3.2V LiFeP04 batteries.
Accurate Battery Type Recognition
Accurate Battery Type Recognition
Battery Capacity Test
Support all of the four battery types and most of the brands.
The First Capacity Tester for Rechargeable 1.5V AA/AAA Li-ion Batteries
* Single click the “mWh/mAh” button to view the energy. (Default display mAh number)
* The mWh volume of 1.5V Li-ion is the output energy after conversion loss.
Intelligently Auto Match Charging Method
Intelligently detects battery types and auto matches the optimal charging method.Based on the adapter power, battery IR, quantity and status, it auto adjusts the best charging current to maximize battery life.
Manually Select Current Level
* Charging current for 1.2 Ni-MH batteries is fixed at 0.5A.
* The selected charging current level indicates the upperlimit of the current for that slot.
Unique Charging Technology for Different Batteries
3-Stage Charging for Lithium Batteries
Trickle charging for pre-charging or reviving batteries, constant current for fast charging, and constant voltage for full charging – ensuring high accuracy and auto-stop when fully charged.
CVSA Tech for Ni-MH Batteries
Enables faster charging, higher accuracy of full-charge detection and lower battery temperatures.
Real-Time Display of Charging Status
USB-C Input PD 20W
For best user experiences, we recommend using an XTAR PD 20W adapter. For emergency use, you can choose a 5V 2A adapter or one with QC3.0 protocols.
USB-C Input PD 20W
For best user experiences, we recommend using an XTAR PD 20W adapter. For emergency use, you can choose a 5V 2A adapter or one with QC3.0 protocols.
Low-Voltage Battery Recovery
Micro-Current activation technology gets your ‘Dead’ batteries recovered at a higher rate in a safer way.
Leading Protection Technology
Intelligent Detection
Timely Stop When Fully Charged
Over-Current Protection
Over-Charge Protection
Over-Voltage Protection
Short Circuit Protection
Reverse Polarity Protection
Soft Start
Intelligent Detection
Timely Stop When Fully Charged
Over-Current Protection
Over-Charge Protection
Over-Voltage Protection
Short Circuit Protection
Reverse Polarity Protection
Soft Start
| Model | VX4 V2 (Visible Mixer) |
| Input | PD2.0(12V1.67A) / QC3.0(9V2A) / 5V2A |
| Constant Charge Current | 3Ax1 / 2Ax2 / 1Ax4 / 0.5Ax4 / 0.25Ax4 |
| Charge Cutoff Voltage | 3.6/3.7V Li-ion: 4.20±0.05V 1.5V Li-ion: N/A 3.2V LifePO4: 3.65±0.05V 1.2V Ni-MH: 1.45±0.1V |
| Charge Cutoff Current | ≤150mA |
| Operating Temperature | -10-40℃ |
| Dimensions(mm) | L172 × W130 × H41.5 |
| Net Weight(g) | 315 |
Package
New version adds drawstring bag. Both new and old versions are on sale.
Specifications Comparison
Model |
VX4 |
VX4 V2 |
|---|---|---|
|
Appearance |
|
|
|
Compatibility |
Supports XTAR 1.5V Li-ion batteries: |
Supports all XTAR 1.5V Li-ion batteries |
|
Memory Function |
Not Supported |
Supports charging mode memory. |
Specifications Comparison
Model |
VX4 |
VX4 V2 |
|---|---|---|
|
Appearance |
|
|
|
Compatibility |
Supports XTAR 1.5V |
Supports all XTAR |
|
Memory Function |
Not Supported |
Supports charging mode |
XTAR VX4 V2 Charger FAQ
How is the capacity grading accuracy of the VX4 V2 charger?
The VX4 V2 charger uses a 300mA discharge current to test battery capacity. Compared with a professional capacity grading machine, its energy and capacity test accuracy is more than 95%. Under the comparison test of the XTAR lab, with the same test condition, a randomly picked XTAR 1.5V AA 1200mWh battery had real capacity 1161mWh by VX4 V2 charger, and 1129mWh by capacity grading machine. The accuracy error between them is less than 3%.
Why does the VX4 V2 show very different capacity grading results for 1.5V rechargeable Li-ion batteries from different brands?
The capacity grading results of 1.5V rechargeable Li-ion batteries are mainly affected by battery capacity fluctuations, battery energy labeling/claiming methods and charger capacity test standards.
Affected by many factors, the capacity of each battery cell is not exactly the same. For example, the cell capacity fluctuation of the XTAR AA 4150mWh Li-ion battery is about ±5%. The built-in step-down circuit and protection board cause some loss in energy output. The energy loss of XTAR 1.5V lithium batteries is about 10%, which means a higher conversion efficiency in the industry.
Since 1.5V rechargeable Li-ion batteries are an emerging type of battery, different brands use various nominal energy labeling methods. There are mainly: 1)Severe overrated: actual energy is lower than 80% of the nominal energy. 2)Taking the cell energy as the battery’s nominal energy, the actual energy is about 85% to 95% of the nominal energy. 3)Genuine rated: actual energy is about 100% of the nominal energy. 4)Over the rated: actual energy is more than 100% of the nominal energy.
Additionally, the chargers from different brands have various capacity grading standards. Generally, the higher the discharge current, the lower the measured capacity and energy. The VX4 V2’s capacity test standard for 1.5V rechargeable Li-ion batteries is 300mA discharge current and 0.5V cut-off voltage.
Why does the VX4 V2 design capacity grading function for 1.5V rechargeable Li-ion batteries?
As a new generation type, 1.5V AA and AAA rechargeable Li-ion batteries are less common in the market than the regular disposable alkaline and 1.2V NiMH batteries. While the manufacturers becomes more and more, resulting in varying quality and chaotic market. As a leader in the cylindrical lithium battery industry, XTAR has always been at the forefront of technological innovation. We aim to help users easily identify overrated battery and lead the industry toward high-quality and standardization.
Why does the VX4 V2 show higher capacity grading results for high-capacity 3.6/3.7V batteries?
The capacity test is greatly affected by the discharge current. The higher the discharge current, the lower the measured capacity, and vice versa. The discharge current of VX4 V2 is 0.3A, while the international testing standard IEC 61960-3:2017 specifies a 0.2C discharge rate to test the nominal capacity of 3.6/3.7V Li-ion batteries. For example, the nominal capacity value of 26650 6000mAh battery comes from the test with 1.2A discharge. If you test it with VX4 V2 charger, the much lower discharge current would lead to a higher test value than the nominal capacity.
For 3.6/3.7V Li-ion battery, would the set of 2.5V discharge cut-off voltage cause a over-discharging?
No, it won’t. According to the international testing standard IEC 61960-3 2017, the discharge cut-off voltage for 3.6/3.7V Li-ion batteries is 2.5V.
What factors affect battery capacity testing?
There are mainly three factors. The first is the test temperature, the optimal is 20±5℃. Both low and high temperatures will affect the battery discharge performance, and then directly affect the discharge capacity.
The second is the discharge current. The international testing standard IEC 61960-3:2017 specifies a 0.2C discharge rate to test the nominal capacity of 3.6/3.7V Li-ion batteries. There is no unified test standard to test the nominal capacity of 1.5V rechargeable Li-ion batteries. Common test methods use 0.25A discharge for AAA batteries and 0.5A discharge for AA batteries. The higher the discharge current, the lower the discharge capacity. The worse the battery performance (higher internal resistance), the greater the impact of the discharge current.
The third is the cut-off voltage. The IEC testing standard specifies a 2.5V cutoff voltage for 3.6/3.7V lithium-ion batteries. The higher the cut-off voltage, the lower the discharge capacity. To highlight better performance, some 3.6/3.7V Li-ion batteries on the market may use 0.5C discharge or a 2.8V cut-off voltage to measure and claim the nominal capacity.
What effect does a battery with high internal resistance have on capacity testing?
Higher internal resistance restricts current flow, resulting in poor discharge performance. It also consumes some energy. With high internal resistance, the heat loss increases, thereby reducing the battery’s usable capacity.
When grading the XTAR 1.5V AA 4150mWh battery, why is the capacity value lower than claimed rating?
The labeling standard for the nominal energy of XTAR AA 4150mWh and AAA 1620mWh battery is: the energy comes from the cell energy before loss, and the capacity comes from the real measurement at 1.5V output. Due to the cell has 10% output loss, the battery capacity measured by VX4 V2 charger is the output capacity after loss.
The advantage of using the 3.6V cell’s energy as the battery nominal energy is it helps avoid significant fluctuations in energy output due to conversion efficiency. First, the conversion efficiency of constant voltage step-down circuits will improve with industry advancements. Second, there are significant differences in conversion efficiency among different step-down circuits. For example, the conversion efficiencies of the constant voltage step-down circuit is 90%, while that of the linear step-down circuit is only 80%.
Why does VX4 V2 recognize my 3.6V Li-ion battery as a 1.2V NiMH battery?
If your 3.6V Li-ion battery is being recognized as a 1.2V NiMH battery, it likely means that the battery has been over-discharged, with its voltage dropping below 1.65V. When this happens, the charger will enter an activation mode to gently recover the battery.
Once the battery voltage rises above 2V, the charger should automatically correct the battery type to Li-ion. This process may take some time, depending on the battery’s condition.
Click to view detailed comparison of VX4 V2, VC4SL, VP4L PLUS