Charger for cylindrical Li-ion / Ni-MH / Ni-CD 18650 batteries Xtar VC4S

Professional, four-channel processor charger
Xtar VC4S
for Li-ion and Ni-MH batteries in sizes 18650, AA, AAA and others

Key Features

• Charging Li-ion batteries with a three-stage TC/CC/CV charging process controlled by a processor
• Charging Ni-MH batteries using the CC method
• Four independent charging channels
• Charging mode / grade mode (charging/discharging/charging) / storage mode
• 4 charging currents automatically selected - 0.5A / 1A / 2A / 3A
• VA LCD display showing charging capacity, cell voltage, charging current, and internal resistance of the cell
• Powered by any QC3.0 compliant charger
• Function for reactivating deeply discharged cells
• Protections: short circuit, thermal, reverse polarity

VC4S is a professional processor charger with a three-stage TC/CC/CV charging process and an LCD display. It charges 1-4 Li-ion cells 3.6 / 3.7V and Ni-MH of any capacity in sizes AAA/R03, AA/R6, R14/C, D, 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18500, 18650, 18700, 20700, 21700 - only unprotected, 22650, 25500, 26650, 32650.

The backlit VA LCD display of the Xtar VC4S charger continuously shows information about the charger’s operating status: the charge of the batteries expressed in mAh, battery voltage, charging current, and internal resistance of the cell. Additionally, the VC4SL charger has 2 other modes besides the charging function:
The "grade" mode allows for showing the exact capacity of the batteries. In this mode, the charger charges the cells to full, then discharges them, and then charges them to full again. After the process is completed, the charger shows the true capacity of the batteries (capacity from discharge). Another function is the "storage" mode, where the charger does not charge the batteries to the end, but only to an optimal voltage threshold to extend the life of the resting cell.

What is the TC/CC/CV charging method? It is a three-stage charging process for Li-ion cells that ensures the cell remains 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 0.5A to 3A
• 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 left in the charger will undergo a natural self-discharge process. Charging will resume when the voltage on the battery drops below 3.9V.

The Xtar VC4S 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 VC4S charger comes to the rescue, which in many cases allows for 'rescuing' such cells. Just insert the deeply discharged battery into the VC4S 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 important to avoid overly deep discharging of Li-ion batteries - this can lead to a significant reduction in their durability and capacity or render them completely inoperative.

Included with the Xtar VC4S charger is a microUSB cable and a case for easy transport of the charger. The power adapter is not included in the set. To power the charger, any USB socket charger will suffice (a QC3.0 compliant charger is recommended).