Product Description

Professional, dual-channel, super fast processor charger
Xtar ST2
for Li-ion batteries in sizes 18650, 20700, 21700 and others

Key features

charging Li-ion batteries with a three-stage TC/CC/CV charging process controlled by a processor
two independent charging channels
measurement of the internal resistance of the cell
three charging currents to choose from - 1A, 2A, 4.1A
LCD display indicating the charging status of the batteries
reactivation function for deeply discharged cells
protections: short-circuit, thermal, reverse polarity

Xtar is a renowned manufacturer of high-quality chargers for Li-ion batteries, flashlights, and Li-ion batteries. Xtar products are sold in over 120 countries, including the USA, Germany, Japan, and Russia. For the production of Xtar chargers, the highest quality materials are used - from the casing material to efficient electronics. All Xtar chargers have CE certification required in European markets.

XTAR ST2 is a professional processor charger with a three-stage charging process TC/CC/CV and an LCD display. It charges 1-2 Li-ion cells 3.6 / 3.7V of any capacity in sizes 18650, 18700, 20700, 21700, 22650, 25500, 26650.

The backlit LCD display of the Xtar ST2 charger continuously shows the charging status of the batteries expressed in percentage.

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 specified by the user.
CV Phase: when the cell is almost fully 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.

The Xtar ST2 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 ST2 charger comes to the rescue, which in many cases allows for the 'rescue' of such cells. Just insert the deeply discharged battery into the ST2 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 overly deep discharging of Li-ion batteries - this can lead to a significant reduction in their lifespan and capacity or render them completely inoperative.

Also compatible with Li-ion 21700 and 26650

Automatic selection of optimal charging current