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XTAR VX4 V2 Visible Mixer Ni-MH Batteries Charger

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SKU: VX4-VX4 KT(no adapter)
(2)
$42.99
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The First Capacity Tester for 1.5V Lithium Batteries.

About XTAR VX4 Battery Charger

1. How is the capacity grading accuracy of VX4 charger?

The VX4 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 charger, and 1129mWh by capacity grading machine. The accuracy error between them is less than 3%.

2. Why does VX4 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.

3. 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.

4. 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.

5. 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 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%.