Charger for cylindrical Li-ion batteries 18650 Xtar X4

Key Features

• Supports protected 20700 and 21700 cells
• charging of Li-ion batteries with a three-stage processor, TC/CC/CV charging process
• charging Ni-MH batteries using the CC method
• four independent charging channels
• power bank function - USB 5V/1A output (only for Li-ion cells in sizes from 18650)
• three charging currents - 2x 2A / 4x 1A / 4x 0.5A (for Ni-MH and Li-ion cells up to 65mm long)
• LCD display informing charging capacity, cell voltage and charging current
• powered by any charger with a 2A USB socket and directly from the 230V mains
• small dimensions - easy to carry
• Deeply discharged cell reactivation function
• protections: short circuit, thermal, against reverse polarity

Xtar is a renowned manufacturer of high-quality Li-ion battery chargers, flashlights and Li-ion batteries. Xtar products are sold in more than 120 countries, including the most important countries. in the USA, Germany, Japan and Russia. Xtar uses the highest quality materials to manufacture its chargers – from the plastic of the housing to the high-performance electronics. All Xtar chargers have the CE certification required for European markets.

The X4 is a professional processor charger with a three-stage TC/CC/CV charging process and an LCD display. It charges 1-4 Li-ion 3.6 / 3.7V and Ni-MH cells of any capacity in sizes AAA/R03, AA/R6, R14/C, 14500, 14650, 16340, 17500, 17670, 18350, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650.

The Xtar X4's backlit VA LCD display shows real-time information about the charger's operating status: battery charge in mAh, battery voltage and charging current.

What is the TC/CC/CV loading method? It is a three-stage charging process for Li-ion cells that ensures that the cell is kept in good condition by charging with the right current at each stage and completing the charging process at the right time.
The different steps 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 of the following values:
  2Ax1/1Ax2/0.5Ax4 - micro USB power supply
  2Ax2/1Ax4 - power supply from 230V
• CV phase: when the cell is almost charged, the charger switches to charging with decreasing current until the voltage of 4.2V on the cell is reached. Once 4.2V is reached, the charging process is complete - the battery is fully charged.

Charged batteries left in the charger will undergo a natural self-discharge process. Charging will resume when the battery voltage drops below 3.9V.

The Xtar X4 charger has the function of reactivating deeply discharged cells and cells with a voltage of 0V. Many chargers on the market are not able to charge such batteries. This is where the Xtar X4 charger comes to the rescue, which in many cases allows you to 'rescue' such cells. Simply insert a deeply discharged battery into the X4 charger as you would with normal charging - the charger will detect the discharged battery and attempt to reactivate it.

Remark! Cells discharged below a certain level are irreversibly damaged and may not be able to reactivate. Avoid discharging Li-ion batteries too deeply - this can lead to a significant reduction in their durability and capacity or lead to their complete inefficiency.

The Xtar X4 has an additional power bank function with a 5V USB output with a maximum power of 1A. As a power source, you can use a Li-ion battery in size from 18650 with a capacity of at least 2200mAh. To use the power bank function, disconnect the charger from the power supply and place the battery in it.

REMARK! The USB output is electronically protected against overload and automatically switches off when the power consumption exceeds 1A.

The Xtar X4 charger comes with a 230V 2-pin power cable (the so-called eight). A power adapter is not included. To power the charger, all you need is any charger with a USB socket, e.g. from a phone, or a USB socket, or a computer with a free USB port. The recommended power of the charger is 2.1A (2100mA).