Li-ion 18650 cylindrical battery charger Xtar D4

Professional, compact processor charger
Xtar D4
for Li-ion batteries in sizes 18650 and others

Key Features

• microprocessor-controlled three-stage charging process TC/CC/CV
• automatically selected charging current 2x2A / 4x1A / 2x0.5A (CH2&CH3) + 2x1A
• four independent charging channels
• powered from the 230V mains (cable included)
• compact size - easy to carry
• reactivation function for deeply discharged cells
• protections: short-circuit, thermal, against reverse polarity

Hidden in a small casing is a fully professional microprocessor charger with a three-stage charging process TC/CC/CV. It charges Li-ion cells 3.6 / 3.7V of any capacity in sizes 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650.

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 of 2x2A / 4x1A / 2x0.5A (CH2&CH3) + 2x1A.
• CV Phase: when the cell is almost charged, the charger switches to charging with a decreasing current until the voltage of 4.2V is reached on the cell. After reaching 4.2V, the charging process is complete - the battery is fully charged.

Batteries with a voltage of 4.1V or higher are treated by the charger as charged. To charge such a battery to full, it should be placed in the charger before plugging it into the power supply. Batteries left in the charger that are charged will undergo a natural self-discharge process. Charging will resume when the voltage on the battery drops below 4.1V.

The Xtar D4 charger has a reactivation function for deeply discharged cells and cells with a voltage of 0V. Many chargers on the market are unable to charge such batteries. Here, the Xtar D4 charger comes to the rescue, which in many cases allows for the 'rescue' of such cells. Just place the deeply discharged battery in the D4 charger, just like during 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 overly 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 D4 charger, Xtar has gone a step further than the competition, solving this problem in a simple way: external power supply was used. Thanks to this, the temperature of the battery charged in the D4 will rise by a maximum of 15 degrees.

Included with the Xtar D4 charger is a 230V power cable.