Fast charger for cylindrical li-ion 18650 batteries Xtar VP2

Professional, fast processor charger
Xtar VP2
for Li-ion and LiFePO4 batteries in sizes 18650 and others

Key Features

• microprocessor-controlled three-stage charging process TC/CC/CV
• fast - maximum charging current 1A!
• three charging currents to choose from 0.25A / 0.5A / 1A
• LCD display
• supports Li-ion cells 3.6/3.7/3.8V and LiFePO4 3.2V
• compact size - easy to carry
• power bank function (USB output)
• deeply discharged cell reactivation function
• protections: short circuit, thermal, reverse polarity

Hidden in a small casing is a fully professional microprocessor charger with a three-stage charging process TC/CC/CV. The Xtar VP2 charges standard Li-ion cells 3.6 / 3.7V and Li-ion with an increased voltage of 3.8V as well as lithium-iron phosphate (LiFePO4) batteries. From the mentioned types, batteries of any capacity in sizes 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650 are supported. The type of cell is selected using a switch located at the back of the casing, and the charging current is set with a button on the casing. The voltage for both charging channels is set together - it is not possible to charge cells with different nominal voltages simultaneously. The charging current is also common for both channels.

The Xtar VP2 is equipped with an LCD display that informs about the charging current, charging progress, and the current voltage of the batteries. In unused channels, the currently selected charging voltage is displayed.

What is the TC/CC/CV charging method? It is a three-stage charging process for Li-ion cells that ensures the cell is kept in good condition by charging with the appropriate current at each stage and completing the charging process at the right moment.
The individual stages of the TC/CC/CV process are:

• TC Phase: cells discharged below 2.9V are 'woken up' with a lower current.
• CC Phase: after reaching 2.9V, the cell is charged with a constant current and voltage value selected by the user (default 0.25A).
• CV Phase: when the cell is almost charged, the charger switches to charging with a decreasing current until the appropriate voltage on the cell is reached. Once it is reached, the charging process is completed - the battery is fully charged.

Batteries left in the charger will undergo a natural self-discharge process. Charging will resume when the voltage on the battery drops below 3.9V for Li-ion and 3.3V for LiFePO4.

The Xtar VP2 charger has a function for reactivating deeply discharged cells and cells with a voltage of 0V. Many chargers on the market are unable to charge such batteries. Here, the Xtar VP2 charger comes to the rescue, which in many cases allows for the 'rescue' of such cells. Just insert the deeply discharged battery into the VP2 charger, just like with normal charging - the charger will detect the discharged cell and attempt to reactivate it. Note! Cells discharged below a certain level may suffer irreversible damage, and their reactivation may be impossible. It is advisable to avoid excessively deep discharging of Li-ion batteries - this can lead to a significant reduction in their lifespan and capacity or render them completely inoperative.

Chargers from other manufacturers can significantly raise the temperature of the charged cells during charging. Excessive heating of the cells can cause them to wear out faster. In designing the VP2 charger, Xtar has gone a step further than the competition, solving this problem in a simple way: external power supply was used. As a result, the temperature of the battery being charged in the VP2 will rise by a maximum of 15 degrees.

The Xtar VP2 also has an additional power bank function with a USB output of 5V 1A. Any Li-ion or LiFePO4 battery with a capacity of at least 2200mAh can be used as a power source. To use the power bank function, the charger must be disconnected from the mains or car power supply, place the battery in the first channel of the charger, and hold the charging current selection button for 1.5s. The discharge state of the battery is indicated by a light on the charger casing.

Included with the Xtar VP2 charger is a mains power supply with an EU plug and a 12V car lighter cable.